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Honeywell True HEPA Air Purifier, Airborne Allergen Reducer for Large Rooms (390 sq ft), White - Wildfire/Smoke, Pollen, Pet Dander, and Dust Air Purifier, 50250-S

4.6 4.6 out of 5 stars 4,660 ratings

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390 sq. ft
Color White
Brand Honeywell
Product Dimensions 18"D x 18"W x 19"H
Floor Area 390 Square Feet
Noise Level 60 dB
Power Source
AC
Item Weight
21 Pounds
Control Method
Touch
Filter Type
HEPA

About this item

  • LARGE ROOM AIR PURIFIER – Help make the air in your home cleaner with the Honeywell 50250-S HEPA Air Purifier. Recommended for large & extra-large rooms (465 sq. feet), it helps capture up to 99.97% of airborne particles as small as 0.3 microns.*
  • HELPS REMOVE MICROSCOPIC PARTICLES AND MORE - This HEPA air purifier has 3 air cleaning levels. It can help remove particles like pet dander, pollen, dust, and smoke*. It can also help reduce certain bacteria, mold spores and viruses***.
  • EFFECTIVE AIR CLEANING AND CIRCULATION –Honeywell Air Purifier for home filters and circulates air in extra-large 465 sq. ft. rooms up to 5 times an hour – 120x per day. You can breathe easy knowing the air in your home is cleaner and has fewer allergens.
  • #1 BRAND RECOMMENDED BY ALLERGISTS** – Honeywell Air Purifier, The Doctor’s Choice, is the #1 brand recommended by allergists. Backed with a 5-year warranty, Honeywell air purifiers are a trusted partner in the fight against airborne particles.
  • COMPATIBLE DOES NOT MEAN COMPARABLE – For best performance, use only genuine Honeywell air purifier filters. Compatible air purifier filter replacements are not guaranteed to offer the same performance or efficiency.

Customer ratings by feature

Easy to assemble
4.7 4.7
Durability
4.5 4.5
Quality of material
4.4 4.4
Sleep quality
4.3 4.3

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Product Warranty: For warranty information about this product, please click here [PDF ]

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Honeywell True HEPA Air Purifier, Airborne Allergen Reducer for Large Rooms (390 sq ft), White - Wildfire/Smoke, Pollen, Pet Dander, and Dust Air Purifier, 50250-S


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Product Description

Product Description

*From the air that passes through the filter. Overall particle reduction depends on many factors including the amount of air processed, the pollutant type and the pollutant introduction rate into the environment.    **When operated with the odor reducing pre-filter. It is recommended that the pre-filter be replaced every 3 months to effectively reduce common household odors and gases in a room. This product does not reduce or absorb carbon monoxide gas. Make sure gas appliances are well ventilated.     ***Based on 11/10 AQS survey results reporting 124 out of 172 (72%) of surveyed Allergists that recommend an air purifier to their patients, recommend "Honeywell" air purifiers. cfmTobacco Smoke: 250, Dust: 250, Pollen: 250

Amazon.com

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The 50250-S offers these great benefits:

The Honeywell True HEPA Air Purifier was designed for extra large spaces! The permanent HEPA Filter helps caputure airborne particles 0.3 microns or larger1, greatly reducing the amount of dust, pollen, pet dander, and mold spores in the air. The 50250-S features 3 cleaning settings and a filter life indicator.


True HEPA Advantages

  • Doctors recommend True HEPA air purifiers.3
  • Long-life HEPA Filter can be vacuumed to extend the filter life—replace in 3-5 years.
  • Glass fiber HEPA filter captures up to 99.97% of particles as small as 0.3 microns!1
  • Carbon activated Pre-filter helps capture larger particles like dust, lint, and fur and reduces common household odors.1,2
  • Intelli-Check™ Electronic Filter Indicator eliminates guess work—tells you when to change or clean your filters.
The 50250-S True HEPA Air Purifier has been AHAM Certified for use in rooms up to 390 square feet. Its certified CADR ratings are:

  • 250 for smoke
  • 250 for dust
  • 250 for pollen
The Honeywell True HEPA Air Purifier circulates the air
in an extra large room up to 5x an hour!

The carbon pre-filter helps capture larger particles, while the True HEPA filter effectively removes microscopic allergens, 0.3 microns or larger.
1



Exactly how small is 0.3 microns?



Shop For Accessories

HRF-AP1 Honeywell Universal Carbon Pre-Filter



Learn More >

1 From the air that passes through the filter. Overall particle reduction depends on many factors including the amount of air processed, the pollutant type and the pollutant introduction rate into the environment.
2 When operated with the odor reducing pre-filter. It is recommended that the pre-filter be replaced every 3 months to effectively reduce common household odors and gases in a room. This product does not reduce or absorb carbon monoxide gas. Make sure gas appliances are well ventilated.
3 Based on 11/10 AQS survey results reporting 124 out of 172 (72%) of surveyed Allergists that recommend an air purifier to their patients, recommend "Honeywell" air purifiers.
4 Up to 35% quieter than similar models

Untitled Document .chartOneCell { background-color: #707070;border: 1px solid #CCC;padding-right: 5px;font-weight: bold;color: #FFF;font-size: 12px;vertical-align: middle; } .chartOneCell img { } 1. Choose the best air purifier for your needs
= recommended = acceptable = not recommended Doctor Recommended for Allergen Reduction For General Air Cleaning
True HEPA Allergen Remover HEPAClean® QuietClean® AirGenius® Smoke Pollen Dust Pet
Dander Mold
Spores Germs Odors VOCs *Purchase "K" pre-filter for QuietClean
® Odor and VOC Reduction 2. Choose your room size
Length x Width = Total Square Feet
True HEPA
Allergen
Remover
HEPAClean® QuietClean® AirGenius® Small
51-99 sq. ft. Medium
100-145 sq. ft. Medium-Large
146-199 sq. ft. Large
200-349 sq. ft. Extra Large
350+ sq. ft. 3. Find the right replacement filter
True HEPA
Allergen
Remover
HEPAClean® QuietClean® AirGenius® Pre-filters
captures large particles/reduces odors Medium
captures allergens/
small particles Permanent
Washable Permanent
Washable



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Honeywell True HEPA Air Purifier, Airborne Allergen Reducer for Large Rooms (390 sq ft), White - Wildfire/Smoke, Pollen, Pet Dander, and Dust Air Purifier, 50250-S
Honeywell True HEPA Air Purifier, Airborne Allergen Reducer for Large Rooms (390 sq ft), White - Wildfire/Smoke, Pollen, Pet Dander, and Dust Air Purifier, 50250-S
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Price-19% $129.95
Typical:$159.99
-45% $169.99
List:$309.99
$29.99$129.99-23% $99.00
Typical:$128.00
Delivery
Get it as soon as Wednesday, Nov 13
Get it as soon as Wednesday, Nov 13
Get it as soon as Tuesday, Nov 12
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Customer reviews

4.6 out of 5 stars
4,660 global ratings

Customers say

Customers like the air cleanliness, smell, and value of the product. They mention it works well, removes dust particles from the air, and keeps the air fresh. Some are also happy with allergens and filter quality. However, some customers have reported that the noise level is loud.

AI-generated from the text of customer reviews

1,264 customers mention "Works well"1,178 positive86 negative

Customers like the air purifier. They mention it provides effective, reliable, and particulate removal. Some say the filter works well and helps with allergies. Overall, customers are satisfied with the product's performance.

"...what I wrote at the top of my review--this machine really, really just works, and works alarmingly well.)..." Read more

"...June 22, 2012 Update: The air purifiers (I now have two) continue to run great, however I need to correct a misconception that I had about the pre-..." Read more

"...DECEMBER 2016: I am sitting right next to this filter. Works fine, I run about 12-14 hours continuously, sometimes more per day...." Read more

"...pros and cons, having lived with it for a month, I'm VERY pleased with its overall performance...." Read more

825 customers mention "Air cleanliness"762 positive63 negative

Customers are satisfied with the air cleanliness of the product. They mention it removes a lot of dust particles from the air and is easy to keep clean. Some say the filters are all clean as the day they installed them. Overall, customers say it's the best air purifier they have found.

"...Today there is a minimal amount of dust to be seen on my tables. Huge improvement!!..." Read more

"...about an hour and then on medium for an hour or two did a great job of cleaning the air...." Read more

"...The machine itself has been easy to clean--we just take out the filter strip and run the vacuum over it...." Read more

"...I just recently changed the pre-filter (second changing) and do not see any major dirt on the interior HEPA...." Read more

660 customers mention "Smell"526 positive134 negative

Customers like the smell of the air purifier. They mention it makes a tremendous difference in the air quality of their room and keeps the air fresh.

"...After 24 hours, the air in our home seems much cleaner...." Read more

"...This unit, even on low, puts out enough clean air to create a breeze that will flutter your clothing as you walk by...." Read more

"...the house and remove excess dust in the air, but the air has a noticeably different smell and feel when you enter the house...." Read more

"...We've had this unit for six months, and the difference in our air quality is amazing...." Read more

402 customers mention "Value for money"312 positive90 negative

Customers appreciate the value for money of the air purifier. They mention it's an excellent air purifier for a very affordable price. Customers also say the replacement filters are much cheaper than other brands.

"...We haven't had to replace the main filter yet, but the replacements are relatively inexpensive and are supposed to last at least a year, even at the..." Read more

"...Pros: cheap for this large a room (500 plus square ft), moves air well, easy to set up and operate, bulky but not very heavy...." Read more

"...has long filter life, low maintenance requirements, and reasonable operating costs.Score: 9 of 10, "lifetime" air filter6...." Read more

"...filters themselves, and what they sell under their name is of questionable quality, I will be looking for options at Home Depot, Lowe's, etc...." Read more

296 customers mention "Allergens"287 positive9 negative

Customers are satisfied with the air purifier. They mention it works well for their dog's allergies, helps greatly in combating sinus issues, and reduces sneezing. Some say the device provides excellent protection from airborne allergens while sleeping.

"...Overall, though, the savings in cost and allergy-reduction has been priceless; we're looking at buying smaller but similar units for..." Read more

"...I was however pleasantly surprised at how well it does work at helping ease my allergy symptoms and some of the odors it does seem to help with...." Read more

"...6. This morning I woke up to far less allergy symptoms...." Read more

"...It hasn't cured us, but my symptoms have reduced significantly, and I credit the purifier with that...." Read more

268 customers mention "Filter quality"246 positive22 negative

Customers are satisfied with the air purifier's filter quality. They mention it filters the air extremely well, has efficient DC motors, and better filter options. The inner HEPA filter is still perfect, and it filters fine particles that contribute to allergies. The high setting works the best for filtering. Customers also appreciate that the large filter easily handles their front room and kitchen. The round design offers 360-degree filtration, which they consider preferable.

"...The inner HEPA filter is still perfect!..." Read more

"...S offered by Amazon is about the same as a small tower and it is far more powerful...." Read more

"...I am moderately pleased, certainly happy that I am still feeling some decent filtration and SEEING the bigger dust on the prefilter...." Read more

"...circulation, the Honeywell air purifier's round design offers 360 degree filtration, which I consider preferable to narrow, drafty exhaust..." Read more

268 customers mention "Size"109 positive159 negative

Customers have mixed opinions about the size of the air purifier. Some mention it's fairly large for what it is, best in full-sized rooms, and capable of handling large and extra-large areas. Others say it's kind of larger than expected, has a large footprint, and doesn't like the 360-degree design.

"...The drawbacks? It's a little big/bulky, roughly the size of an end-table, though it covers the right square footage for the room...." Read more

"...of large rooms in my home and the Honeywell 50250-S is perfectly suited for my needs...." Read more

"...The filters are about the same per year. They are tiny however compared to this mammoth beast, see dimensions...." Read more

"...the price, it met my needs better than the others in that it covers a much larger area than one medium-sized room. That said, it is LOUD!..." Read more

1,826 customers mention "Noise level"522 positive1,304 negative

Customers are dissatisfied with the noise level of the air purifier. They mention it's loud enough that it's difficult to hear the TV over it unless it's on low speed.

"...On low it still sounds like box fan on high. But just like running a box fan, you tune it out pretty quickly...." Read more

"...It's also rather loud on "Turbo" mode (the highest setting), so we have to turn it down or off when watching movies...." Read more

"...Most importantly... The purifier still doesn't make any weird noises, no wobbling, no vibration...." Read more

"...me, as it was REALLY smoky in here and, as I mentioned, it's WAY too loud to watch tv or hear any music or have a conversation with it on high so I..." Read more

Always Works Alarmingly Well! Have Bought This Amazing Machine Three Times in Two Decades
5 out of 5 stars
Always Works Alarmingly Well! Have Bought This Amazing Machine Three Times in Two Decades
I just bought this unit for the third time in 20 years. In the mid-90s in Brooklyn, I bought it to help with cat allergies and kept it for 6 years. In the mid-2000s in Chicago, I bought it to help with dirty downtown-apartment air and kept it for 5 years. Now, I have it once again in a Chicago apartment to help with a "sick air" residential building (dust/mold/dirt from hallway and facade renovations.) It has never failed me. Like the other 80 percent of reviewers giving four or five stars all say, it just works. Like, works in the way that products used to work 20 years ago.The people complaining that it's an old, bulky design that's a little louder than more modern units? Good! The last "more modern" unit I had--a Holmes mini-tower HEPA purifier--allowed so much air to bypass the HEPA filter, it spit out black soot on my walls and floors. It ended up on a one-way trip down the garbage chute after two years of my partner and me wondering why we always felt sick and congested even though we ran the unit 24/7. I opened up the unit and found everything inside caked with thick black gunk from all the bypassed air.Yes, on Turbo the Honeywell 50250 sounds like a 737 ready for takeoff. But you only run it that high when you really need to, which is rare. On low it still sounds like box fan on high. But just like running a box fan, you tune it out pretty quickly. Eventually, your house comes to feel weird without the noise of the unit in the background. Most of all, you feel an immediate change in the air. This unit, even on low, puts out enough clean air to create a breeze that will flutter your clothing as you walk by. If you live in a "sick" building like we do, you will notice the difference every time you enter and leave your front door, and it's a big difference.You do have to replace the pre-filter (which is relatively inexpensive) every three months. You can cheat and wash it like I used to, but the charcoal just washes away eventually. You really do want to replace it. You can carefully vacuum the outside of your HEPA filter but you won't need to replace it--which is good since it's more expensive--more than every three years or so. Most important is to keep the outside of the unit clean/vacuumed and replace the prefilter. A dirty prefilter you refuse to replace will make the machine become very loud and very inefficient. TRUST ME on this--I've been there too many times in the many years I've owned this machine. Do yourself a favor and just buy a few pre-filters in advance.The machine feels all 20 of its pounds heavy, but the handle on top makes it manageable to move, or to carry from room to room. We will eventually get Honeywell's small (sub-100 sq. ft.) True HEPA machine for our bedroom, but for now we split the machine's time between living/dining room and bedroom. A couple of hours in a new room is enough to make it feel like brand-new room. (I can't stress enough what I wrote at the top of my review--this machine really, really just works, and works alarmingly well.)I've added photos of the unit and its box so you can get an idea of its size and bulk relative to normal furniture (and normal-size adult cats!) In the photos, you can also see what the inside of the unit looks like when it's open, top and bottom, as well as see how the pre-filter wraps around the HEPA filter and is secured with two Velcro strips.I can't speak to power use, but even on low the machine is noticeably powerful. Over the years, we replaced all our incandescent bulbs with compact fluorescents and LEDs, so it will be apparent pretty quickly if our electric bill goes up significantly. I may come back to this review in a couple of months to revise it with the change we notice in our bill from running the machine on low 24/7.And, please, don't be silly. The machine was designed to run 24/7. The instruction booklet suggests you run it 24/7. If you want all the wide and nifty health benefits of clean indoor air (cardio-pulmonary, cognitive, attention-related, stress-related), run it on low 24/7. I only ever turned my previous two machines off to change the filters. Then again, you'll probably come to love the device so much that not running it will feel like leaving your house without your cell phone.Having this machine again is like seeing a beloved old friend again. I can't believe how much I missed it, or how much better the air is in my apartment already. HIGHLY recommended!!!
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Top reviews from the United States

Reviewed in the United States on October 21, 2015
Size: 390 sq. ftVerified Purchase
*** Update! ***
We've now had this air purifier for more than 2 years and it's still going strong. It's on a timer to run from midnight to 7am every day. We run it at night because it does get a bit loud in the living room while watching TV now that we don't have ceiling fans and the air conditioner running (winter time!). Most importantly... The purifier still doesn't make any weird noises, no wobbling, no vibration.

I vacuum the outer filter (the black carbon filter) probably once a month now and it is still perfectly fine and in good shape. The inner HEPA filter is still perfect! Maintaining the outer filter keeps anything from really getting to the inner filter which is great.

***UPDATE***
So we've had this air purifier for about 2 weeks now. Still loving it! The amount of dust in our house has been greatly reduced. Still no wobbling, buzzing, or irritating noises. The suction is still going strong. I have noticed that with the air purifier on, I don't need to turn on the ceiling fan; the purifier moves the air enough that the ceiling fan just isn't needed.
I love this unit so much that I recently purchased one for my mom! I'll update again with her opinion of the purifier after she's had it for a while.
I did notice that a couple days after buying my mom's, the price jumped up to $187. For whatever reason, the price on this air purifier changes from $127 to $187 then back to $127 frequently. If it's $187 when you're looking at it, give it a week and the price will probably drop again.
Thanks!

***Original post:
We've only had this purifier for one day so far but here are my observations thus far:

Super easy to set up. Remove the unit from the box, unscrew the bottom handle, lift the cover from the unit, wrap pre-filter around HEPA filter, replace cover, put screw back on. Plug in unit, turn on. Done.

Yes, this unit is loud, but not intolerable. With it on low, I can hear the TV just fine without having to turn up the volume. However, on high, the sound is fairly close to that of a hair dryer.
I'm usually very sensitive to noises, but this sounds like a fan (which... it basically is, the vents blow air straight up from the top of the unit). I'm one of those people who simply cannot sleep without a fan on so, this fits right into my comfort zone as far as noises go. There are no odd whirring, buzzing, rattling or humming sounds.
As an added bonus, with the unit on low, the white noise effect blocks out a lot of our random outside noises (vehicles, neighborhood pets) that usually drive my Shih Tzus crazy. Their random barking has decreased significantly!

The suction is great. If I place a piece of paper near the side of the unit while it's on high, it'll suck the paper right to it. With the unit on low, it doesn't pull the paper to it, but will hold the paper in place if the paper is touched to the side.

I read reviews where people complained about the blue light. It's no brighter than an average alarm clock or the time display on a microwave. This is a non-issue for me personally.
I also read that people had issues with the purifier wobbling or being unsteady. I have mine sitting on top of a side table that sits on top of carpet. Zero wobbling, no vibrations.

It is also worth noting that my house is very open planned; the main living areas (living room, dining room, kitchen and utility room are together/separated by arches) and the area the purifier is working in right now is well over the 350 sq. ft recommended for this unit.

After 24 hours, the air in our home seems much cleaner. We have major dust issues due to living on a non-paved road, having tons of carpeting \and heavy curtains throughout the house, and cotton fields all around us.
Generally, after I dust, there is a fine layer of dust on all surfaces again by the next day. I dusted yesterday right after turning this purifier on. Today there is a minimal amount of dust to be seen on my tables. Huge improvement!!

So yes, after one day, I'm pretty happy with this purifier. Here's hoping this unit lasts a long, long time! =)
32 people found this helpful
Report
Reviewed in the United States on November 15, 2017
Size: 390 sq. ftVerified Purchase
I just bought this unit for the third time in 20 years. In the mid-90s in Brooklyn, I bought it to help with cat allergies and kept it for 6 years. In the mid-2000s in Chicago, I bought it to help with dirty downtown-apartment air and kept it for 5 years. Now, I have it once again in a Chicago apartment to help with a "sick air" residential building (dust/mold/dirt from hallway and facade renovations.) It has never failed me. Like the other 80 percent of reviewers giving four or five stars all say, it just works. Like, works in the way that products used to work 20 years ago.

The people complaining that it's an old, bulky design that's a little louder than more modern units? Good! The last "more modern" unit I had--a Holmes mini-tower HEPA purifier--allowed so much air to bypass the HEPA filter, it spit out black soot on my walls and floors. It ended up on a one-way trip down the garbage chute after two years of my partner and me wondering why we always felt sick and congested even though we ran the unit 24/7. I opened up the unit and found everything inside caked with thick black gunk from all the bypassed air.

Yes, on Turbo the Honeywell 50250 sounds like a 737 ready for takeoff. But you only run it that high when you really need to, which is rare. On low it still sounds like box fan on high. But just like running a box fan, you tune it out pretty quickly. Eventually, your house comes to feel weird without the noise of the unit in the background. Most of all, you feel an immediate change in the air. This unit, even on low, puts out enough clean air to create a breeze that will flutter your clothing as you walk by. If you live in a "sick" building like we do, you will notice the difference every time you enter and leave your front door, and it's a big difference.

You do have to replace the pre-filter (which is relatively inexpensive) every three months. You can cheat and wash it like I used to, but the charcoal just washes away eventually. You really do want to replace it. You can carefully vacuum the outside of your HEPA filter but you won't need to replace it--which is good since it's more expensive--more than every three years or so. Most important is to keep the outside of the unit clean/vacuumed and replace the prefilter. A dirty prefilter you refuse to replace will make the machine become very loud and very inefficient. TRUST ME on this--I've been there too many times in the many years I've owned this machine. Do yourself a favor and just buy a few pre-filters in advance.

The machine feels all 20 of its pounds heavy, but the handle on top makes it manageable to move, or to carry from room to room. We will eventually get Honeywell's small (sub-100 sq. ft.) True HEPA machine for our bedroom, but for now we split the machine's time between living/dining room and bedroom. A couple of hours in a new room is enough to make it feel like brand-new room. (I can't stress enough what I wrote at the top of my review--this machine really, really just works, and works alarmingly well.)

I've added photos of the unit and its box so you can get an idea of its size and bulk relative to normal furniture (and normal-size adult cats!) In the photos, you can also see what the inside of the unit looks like when it's open, top and bottom, as well as see how the pre-filter wraps around the HEPA filter and is secured with two Velcro strips.

I can't speak to power use, but even on low the machine is noticeably powerful. Over the years, we replaced all our incandescent bulbs with compact fluorescents and LEDs, so it will be apparent pretty quickly if our electric bill goes up significantly. I may come back to this review in a couple of months to revise it with the change we notice in our bill from running the machine on low 24/7.

And, please, don't be silly. The machine was designed to run 24/7. The instruction booklet suggests you run it 24/7. If you want all the wide and nifty health benefits of clean indoor air (cardio-pulmonary, cognitive, attention-related, stress-related), run it on low 24/7. I only ever turned my previous two machines off to change the filters. Then again, you'll probably come to love the device so much that not running it will feel like leaving your house without your cell phone.

Having this machine again is like seeing a beloved old friend again. I can't believe how much I missed it, or how much better the air is in my apartment already. HIGHLY recommended!!!
Customer image
5.0 out of 5 stars Always Works Alarmingly Well! Have Bought This Amazing Machine Three Times in Two Decades
Reviewed in the United States on November 15, 2017
I just bought this unit for the third time in 20 years. In the mid-90s in Brooklyn, I bought it to help with cat allergies and kept it for 6 years. In the mid-2000s in Chicago, I bought it to help with dirty downtown-apartment air and kept it for 5 years. Now, I have it once again in a Chicago apartment to help with a "sick air" residential building (dust/mold/dirt from hallway and facade renovations.) It has never failed me. Like the other 80 percent of reviewers giving four or five stars all say, it just works. Like, works in the way that products used to work 20 years ago.

The people complaining that it's an old, bulky design that's a little louder than more modern units? Good! The last "more modern" unit I had--a Holmes mini-tower HEPA purifier--allowed so much air to bypass the HEPA filter, it spit out black soot on my walls and floors. It ended up on a one-way trip down the garbage chute after two years of my partner and me wondering why we always felt sick and congested even though we ran the unit 24/7. I opened up the unit and found everything inside caked with thick black gunk from all the bypassed air.

Yes, on Turbo the Honeywell 50250 sounds like a 737 ready for takeoff. But you only run it that high when you really need to, which is rare. On low it still sounds like box fan on high. But just like running a box fan, you tune it out pretty quickly. Eventually, your house comes to feel weird without the noise of the unit in the background. Most of all, you feel an immediate change in the air. This unit, even on low, puts out enough clean air to create a breeze that will flutter your clothing as you walk by. If you live in a "sick" building like we do, you will notice the difference every time you enter and leave your front door, and it's a big difference.

You do have to replace the pre-filter (which is relatively inexpensive) every three months. You can cheat and wash it like I used to, but the charcoal just washes away eventually. You really do want to replace it. You can carefully vacuum the outside of your HEPA filter but you won't need to replace it--which is good since it's more expensive--more than every three years or so. Most important is to keep the outside of the unit clean/vacuumed and replace the prefilter. A dirty prefilter you refuse to replace will make the machine become very loud and very inefficient. TRUST ME on this--I've been there too many times in the many years I've owned this machine. Do yourself a favor and just buy a few pre-filters in advance.

The machine feels all 20 of its pounds heavy, but the handle on top makes it manageable to move, or to carry from room to room. We will eventually get Honeywell's small (sub-100 sq. ft.) True HEPA machine for our bedroom, but for now we split the machine's time between living/dining room and bedroom. A couple of hours in a new room is enough to make it feel like brand-new room. (I can't stress enough what I wrote at the top of my review--this machine really, really just works, and works alarmingly well.)

I've added photos of the unit and its box so you can get an idea of its size and bulk relative to normal furniture (and normal-size adult cats!) In the photos, you can also see what the inside of the unit looks like when it's open, top and bottom, as well as see how the pre-filter wraps around the HEPA filter and is secured with two Velcro strips.

I can't speak to power use, but even on low the machine is noticeably powerful. Over the years, we replaced all our incandescent bulbs with compact fluorescents and LEDs, so it will be apparent pretty quickly if our electric bill goes up significantly. I may come back to this review in a couple of months to revise it with the change we notice in our bill from running the machine on low 24/7.

And, please, don't be silly. The machine was designed to run 24/7. The instruction booklet suggests you run it 24/7. If you want all the wide and nifty health benefits of clean indoor air (cardio-pulmonary, cognitive, attention-related, stress-related), run it on low 24/7. I only ever turned my previous two machines off to change the filters. Then again, you'll probably come to love the device so much that not running it will feel like leaving your house without your cell phone.

Having this machine again is like seeing a beloved old friend again. I can't believe how much I missed it, or how much better the air is in my apartment already. HIGHLY recommended!!!
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rachelleme
5.0 out of 5 stars The best air purifier ever.
Reviewed in Canada on May 5, 2024
Size: 390 sq. ftVerified Purchase
I will never use anything else.

I first bought a Honeywell 50250 True HEPA air purifier in 2007. I have bought other Honeywell air purifiers since, and other brand air purifiers, but none were as good as this. Kaz stopped making it for awhile, then more recently brought it back, only this time they weren't selling it in Canada. So I've had to buy two from US sellers on Amazon.

I have multiple allergies, and I live in an industrial city where breathing the air is like smoking X number of cigarettes a day. Contrary to popular opinion, the air in my home is cleaner than the air outside. If I DO open the windows to "air out" the place, I then have to close the windows and run my two Honeywell 50250s on full for an hour to clean that "fresh" air.

I've never been able to sleep well without foam ear plugs, and when I bought my first 50250, I found that the ear plugs are just fine for keeping the noise from the air purifiers out.
Yes, they are loud on speeds 2 and 3. You know why? Because they're POWERFUL. I've tried the other, quieter air purifiers that people claim are superior because they're quiet. You know why they're quiet? Because they're inefficient.
Here's a story: I have a 50250 in my bedroom and wanted an air purifier in my living room. I bought a highly-praised, quiet Swedish-brand air purifier and put it in the bedroom, and moved the 50250 into the living room. I put the quiet air purifier on high and left the bedroom. I enjoyed fresh, clean air in my living room that day. When I went into the bedroom that night, I couldn't breathe in there; all the nasty things that the 50250 removes had comfortably moved into the bedroom, and the quiet air purifier wasn't doing much of anything to address them, even though the light indicator said the air was 100% great.

So I returned the famous air purifier and bought another 50250. Now I can breathe again.

I keep both of them on speed 1 most of the time, running 24/7. When I am cooking something smelly, I crank the closest one up to 3 while I cook, then back down to 1 when I'm finished. There are no cooking smells in my apartment.

I wish that something this efficient could be fitted into a smaller case, but it can't. This kind of power requires size. I had to admit defeat on finding a smaller air purifier that can come close to the 50250 in terms of efficiency, and settle for giving up some of my floor space if I want to breathe.
From now on I will never get anything else.

Things to watch for:

1. When you first get your 50250, take out the filter and inspect the motor casing. If you see any cracks, return it immediately. The crack will let lubricant escape and the thing will die.

2. Learn how to take it apart so you can oil it when it starts to squeal. After several years it will do so but with the help of a couple of YouTube videos, I have taken the 50250 apart, lubricated it with 3-in-1 motor oil, put it back together, and had it run for another few years before needing another oiling.
You have to lift the handle cap off (a plastic tab may break), unscrew the handle, unscrew and lift off the lid, wiggle up the round washer-thing on the top of the stem, lift off the black rotator piece, then put the oil on the metal stem and spin the stem a bit so the oil works in. Test it by plugging it in and running it on low. When there are no more squeals, reverse and put it all back together again.
You don't have to be big and strong to do this: I am a small, senior lady with arthritis, and I did not require help.

3. You may never have to replace the filter! Just make sure you have the black carbon filter over the main filter, to keep out the big stuff. The old carbon filters that came with the 50250 used to be thick. Now Honeywell sells thin ones, so I double them up. Every three months I remove all the filters and vacuum them thoroughly before putting them back.

You reset the "Check filter" lights by holding them down for maybe 5 seconds.

Generic-brand filters are available on Amazon. The old 50250s all came with a one-piece tall filter. Now I understand that some now come with three shorter filters that stack. That sounds like a pretty inefficient thing to do in a True HEPA air purifier. My most recent (February 2024) 50250 came with the tall, single filter, for which I am grateful. If it had not, I would have spent the money to get a single-piece generic-brand filter. They are just as good, IMO. It's the 50250's casing and fan-power that are truly superior to other air purifiers out there, including Honeywell/Kaz/Helen of Troy's other models.
Michel Eleazar García Gallardo
4.0 out of 5 stars Bueno pero ruidoso
Reviewed in Mexico on January 14, 2019
Size: 390 sq. ftVerified Purchase
Es bueno y fácil de cambiar el filtro solo que hace mucho ruido por lo cual lo prendemos solo cuando no estamos.
Julia
5.0 out of 5 stars Must have for allergy sufferers
Reviewed in Canada on July 12, 2014
Size: 390 sq. ftVerified Purchase
I had had a similar Honeywell Hepa filter that was purchased more than 20 years ago. I was unable to find replacement filters so I stopped using it about 3 years ago when we moved to a new energy efficient home. This spring, my whole family started suffering from allergies. My 8 year old son developed mild constant asthma as well. The filter arrived yesterday. Within seconds of plugging it in, I felt as though the house had been infused with oxygen. I can breathe so much easier, and I had not realized that my breathing had been suffering.

At full blast, there is a loud constant noise, but it's from the air movement. I can't hear any motor noise at all. The air movement helps with air circulation as well. I can run the air conditioner at a higher temperature than I was without the filer.
C M Bibeau
5.0 out of 5 stars Very efficient
Reviewed in Canada on October 13, 2024
Size: 390 sq. ftVerified Purchase
This has made our bedroom so much nicer.
Will get another one for downstairs when they go back down in price.
Gabriela Rodriguez B
1.0 out of 5 stars Muy ruidoso
Reviewed in Mexico on September 3, 2020
Size: 390 sq. ftVerified Purchase
Super ruidoso, lo regrese. Creo que hay mejores opciones en el mercado aunque mas costosas