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318 of 330 people found the following review helpful:
2.0 out of 5 stars
What you need to know about Portable Air Conditioners before you buy, September 16, 2009
A Kid's Review
This review is from: Koldfront 8,000 BTU Ultra Compact Portable Air Conditioner (Kitchen)
Hello everyone!
Portable air conditioners work by taking the air from your room, cooling it, and blowing the hot air out through an exhaust hose attached to your window.
But blowing hot air to the outside creates negative pressure inside your room which, in turn, pulls in more hot air from the outside (the amount of air blown out is equal to the amount of air pulled in). It is kind of self defeating.
The portable air conditioner is able to cool your room as long as the air it exhausts is hotter than the hot air pulled in, then there is an overall cooling effect. But as the temperature outside increas, a small A/C unit may not have enough BTU to to cool the air enough to compensate the hot air being sucked in.
I made the mistake of using a traditional web based cooling calculator to estimate the amount of BTU's needed for a portable A/C. If I had read the web page more carefully I would have noticed that these BTU calculators are for window/wall mounted air conditioners. The major difference between a window A/C and a portable A/C is that the window unit has its heat exchange coils outside and does not create negative pressure in your room (in other words, the cold air in the room is not directly diluted by warm air being sucked in from the outside). Without the negative pressure, there is no hot air being pulled in, so the amount of BTUs needed to cool the room is much less. Of course, even with a window A/C, warm air still seeps into the room but at a lower rate.
I estimate that I would need at least 50% more BTU in a portable air conditioner than that shown in web based BTU calculator for my needs. So instead of the 8,000 BTU Koldfront unit, I should have gotten a 12,000 BTU portable air conditioner.
Note: some portables A/C have two hoses, one for the exhaust and one for the intake so they do not create negative pressure. These units are more effecient and the web based BTU calculator should apply.
Here are the key takeaways:
1. Unless you have a two hose model (which maintains neutral pressure in your room), these portable A/C units are inefficient and are more costly to operate than a conventional through the wall/window air conditioner.
2. If you can, try to get a two hose portable A/C unit. But if not, then you will probably need to increase the portable's BTUs by 50% (or 1.5x) when using a conventional web based BTU calculator. CompactAppliance tried to warn me but I didn't listen. What did you expect from a 13yr old? :-).
3. Do buy from a reputable dealer, such as CompactAppliance. They graciously accepted my return without any hassles. Be sure you always read the vendor's return policy (some have reasonable restocking fees but some won't take it back at all!)
I hope this was helpful.
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60 of 66 people found the following review helpful:
4.0 out of 5 stars
Decent for small rooms, July 31, 2009
This review is from: Koldfront 8,000 BTU Ultra Compact Portable Air Conditioner (Kitchen)
We just had a record-breaking heat wave. I live in a poorly-insulated house that becomes hot in 85-degree weather, and we hit 100. (Just north of Seattle, WA.) This A/C did a great job of cooling two small rooms (cool one room, move the A/C to another room, cool that one, then back again, for about a week).
Some observations:
1. You MUST vent a portable A/C out a window or into a drop-ceiling, or you just pump the hot air back into the room.
2. Portables seem to work better when elevated (hot air rises, so this helps keep the "convection effect" going by getting closer to the hot air).
3. It's a little noisy. Adding rubber gasket material to the vents reduces the noise a lot by damping the vibrations.
4. An A/C's BTU rating must match the room size, or the unit simply won't work right. This is true of all A/Cs, and seems to be somewhat critical for portables.
5. It acts as a dehumidifier, which means that you have to drain the water tank regularly or the unit will shut off until you do. (An indicator light tells you when you need to drain the tank.)
So, for those who need to cool small rooms, I think this is a good buy. It has been for me.
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Follow-Up on Aug 28, 2009:
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I just put the a/c into the garage to store until next year. This thing worked beautifully in the small rooms, but I didn't try it in any of the larger rooms.
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Follow-Up on Aug 31, 2010:
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I just put it into the garage to store until next year. This year I used it in one of the larger rooms because I installed a window a/c in the smaller room, and it did a decent job of keeping the place cool. So far I've had two seasons of trouble-free cooling, so I'd say I got my money's worth. I may buy one more next year for my studio.
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92 of 107 people found the following review helpful:
1.0 out of 5 stars
Whatever you do, DO NOT BUY THIS., July 13, 2009
This review is from: Koldfront 8,000 BTU Ultra Compact Portable Air Conditioner (Kitchen)
So, I live in a studio. Not very big at all. You would think this air conditioner would be able to handle keeping it cool. Well, not so much.
Regardless of how low I set it, or how long I kept it running, it kept my studio at 78 degrees. It was actually a better deal to shut it off, open the windows/door and let the air circulate. It actually got cooler in there once I did that.
Moreover, the hose you connect to the window vent is an eye sore, and isn't flexible enough to let your place the unit somewhere convenient. So you end up having to leave the A/C unit in the middle of the room instead of neatly in a corner or against the wall because the vent hose doesn't allow otherwise.
This is pretty much the worse purchase I have made in a LONG time. Worse of all, it doesn't even make sense for me to return it. The seller charges as 12% "re-stocking fee". Moreover, I would need to carry the huge 70+lbs box up and down stairs to get it back to my work so UPS can pick it up. The box is very flimsy once you remove the nylon ribbons that it comes sealed with, and doesn't really allow you to transport it without spending some money on repackaging.
So yeah, I'm stuck with a $300 70+lbs paper weight. Good times.
[EDITED 07/30]: So I was contacted by the seller (CompactApplience) and their conclusion was that my studio was too big for the 8,000 BTU rating. They actually let me return just the A/C unit without having to worry about packing all the awkwardly-shaped pieces, and reimbursed me for everything, including shipping. Although I've decided NOT to try a different unit with a greater BTU rating, I'm leaving this review here so that hopefully people looking into buying this or any other unit are aware of the importance of considering the size of the room you're trying to cool down when you choose the unit BTU. I was remotely aware of that, but didn't look too much into it, and you saw what happened... Luckily for me, the seller handled the situation superbly well. A happy ending, after all. :)
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