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Product Specifications
Part Number RTH6400D
SizeLarge
ColorWhite
ShapeCurved
Item Package Quantity1
Display StyleDigital
Certificationnull
Batteries Required?Yes
Item Dimensions
Weight11.52 Ounces
Length3.25 inches
Width9 inches
Height8.25 inches
Product Features
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Product Description
Amazon.com Product Description
Maximize comfort, reduce household energy use, and save money with the RTH6400D 5-1-1 Programmable Thermostat from Honeywell. Featuring a user-friendly design that lets you program weekdays, Saturdays, and Sundays separately, this thermostat makes it easy to sync your home's heating and cooling system with your schedule.
Convenient and Efficient for At-Home Comfort
You know that turning down your heat at night saves you money, but you hate waking up and making breakfast in a freezing cold kitchen. Or you don't want to run your AC all day while you're at work, but you want your home to be cool and comfortable when you get home. That's where a programmable thermostat makes all the difference.
Offering you the ability to program weekdays together and Saturdays and Sundays independently and allowing you to customize temperatures for four periods per day, this thermostat makes it simple to heat or cool your home for optimum comfort.
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You know that turning down your heat at night saves you money, but you hate waking up and making breakfast in a freezing cold kitchen. Or you don't want to run your AC all day while you're at work, but you want your home to be cool and comfortable when you get home. That's where a programmable thermostat makes all the difference.
 The customized settings add luxury to your home while affording you valuable savings on your energy bill. View larger. |
 Every day is unique. With this thermsostat, enjoy the freedom of pre-programming to fit your different daily needs. View larger. |
An Easy Way to Save Energy and Money
If programmed as directed, this thermostat also offers you the ability to save up to 33-percent on annual heating and cooling costs (savings may depend on the geographic region you live in and your energy usage). When it does come time to change the thermostat's battery, an easy-access compartment makes battery replacement fast and painless.
Exclusive Technology for Reliability and Ease of Use
Programming and monitoring the thermostat is simple with a soft-touch button interface and an easy-to-read display that shows the current room temperature and the set temperature simultaneously. This display is backlit, making it easy to see even in dimly lit rooms and hallways. All readouts are rendered in natural language instead of confusing symbols, and you can select whether you would like temperature readouts to appear in Fahrenheit or Celsius.
The thermostat features Honeywell Smart Response Technology and a feature that enables Auto Changes from Heating to Cooling, which continually adjusting the pre-heating or cooling of your home for effective results and precise comfort control within one-degree F of your desired temperature. The thermostat offers temporary and permanent hold settings for greater convenience.
Broad Compatibility for Use with Your Existing System
This thermostat is compatible with a broad range of 24-volt heating and air conditioning systems, including single-stage heating and cooling, heat pump systems without auxiliary (back-up) heat, gas fireplaces, and heating only or cooling only systems. It is not compatible with multi-stage heating and cooling, heat pump systems with auxiliary (back-up) heat, and electric baseboard heat (120-240 volts).
About Honeywell
With over 120 years of trusted reliability, Honeywell International is a diversified technology and manufacturing leader, serving customers worldwide with aerospace products and services; control technologies for buildings, homes and industry; automotive products; turbochargers; and specialty materials.
Whether you're flying on a plane, driving a car, heating or cooling a home, furnishing an apartment, taking medication or playing a sport, Honeywell products touch most peoples' lives everyday. Honeywell technologies are found in more than 150 million homes, 10 million buildings and a multitude of manufacturing plants around the world.
What's in the Box
RTH6400D 5-1-1 Programmable Thermostat, wire labels, wall anchors, mounting hardware, and an installation and user guide
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From the Manufacturer
A Honeywell programmable thermostat can save you up to 33 percent off your energy bill. You set it up to adjust the temperature when you are away or asleep---times when you don’t necessarily need to heat or cool your home to optimum comfort---and your heating and cooling equipment runs less. The RTH6400D with exclusive Honeywell Smart Response Technology continually adjusts the pre-heating/cooling of your home so you are comfortable at your programmed times. It also automatically determines if your home needs heating or cooling to provide maximum comfort. Simplified programming with easy to follow text instead of symbols.
Product Details
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Customer Reviews
Most Helpful Customer Reviews
39 of 41 people found the following review helpful
The product came with easy instruction on how to install the unit. It only took me 15 mins to finish the setup. I like the big screen and the 7 days program which my old unit didn't have. The instruction for setting up the program is very easy to use. The only thing I would complain is the backlight; it only last 2 to 5 seconds and it doesn't have a button for backlight. In order to see at night, you have to press any of the button. When you press any of the button, the light will come on but it also changes the setting. You have to press the run schedule again to retain back to normal. That is the only annoying part. I bought this unit for 2 reason, one is the Font size and the second is backlight. I hope the newer product will retain the light longer than 2 seconds, and there will be a button for backlight. Besides the minor glitch, the unit is good. 4 stars.
20 of 20 people found the following review helpful
I installed this unit back in September and it has saves about 27% of our normal heating fuel usage compared to the simple mercury switch unit it replaced. if only I had taken the plunge a few years ago I could have saved $1000's just for spending $70. It is intuitive if you want the temp to be 69 at 7 am and it is currently 64 at 630 it will start up ahead of time so when the desired time hits it will be the temp you specified.
18 of 18 people found the following review helpful
Amazon Verified Purchase
I installed this thermostat about six months ago and it works well. I found the installation straightforward and programming sequence intuitive. I especially like the large, well-lit display and the large programming buttons, none of which are hidden behind a panel which must be lifted for access. I also like that heating/cooling periods can be "skipped" so you can program two periods per day (wake/sleep) instead of having to program all four periods (wake/leave/return/sleep). The thermostat has both temporary temperature override (only affects current period) and vacation hold (maintains temperature setting until manually canceled). The unit is well designed and visually appealing.
When reading previous reviews, I had some concerns that almost caused me to not order the product. Luckily, I found that none of these issues presented a problem for me. Here are some of the problems discussed in previous reviews, followed by my answers:
1) Issue: There is no dedicated backlight button and it is not possible to activate the backlight without pressing a button which will then alter thermostat programming. Answer: I found this *not* to be true, and just pressing the temperature up or down button once causes the backlight to come on without changing the temperature set point (just press the button more than once to change the set point). Surprisingly, I didn't see this feature mentioned in any of the product literature.
2) Issue: When setting the unit to "cool", the compressor will *never* come on until the compressor protection interval has expired (five minutes). Answer: I found this to be true only if the compressor has been on within the previous five minutes, so the AC will come on immediately as long as you didn't just turn it off (which is what I would expect).
3) Issue: There is no cycle or "swing" adjustment on the current Honeywell digital thermostats. They are set for a "swing" of plus or minus one degree. Answer: This is true, and there is no direct way to set the swing so you can reduce the amount of cycling of heating/cooling. That said, there is a "heating cycle rate" setting for different types of heating systems (Function 5 in System Setup). This is set to "gas or oil furnace less than 90% efficient" by default, and needs to be changed for electric, hot water, high-efficiency, steam or gravity heating systems. I believe many people will need to change this setting to match their heating system type. Also, if you find that your heating system continues to cycle too often when the thermostat is set to the correct heating system type, you may be able to reduce cycling by choosing a different setting (but only do so at your own risk).
Hope this helps.
When reading previous reviews, I had some concerns that almost caused me to not order the product. Luckily, I found that none of these issues presented a problem for me. Here are some of the problems discussed in previous reviews, followed by my answers:
1) Issue: There is no dedicated backlight button and it is not possible to activate the backlight without pressing a button which will then alter thermostat programming. Answer: I found this *not* to be true, and just pressing the temperature up or down button once causes the backlight to come on without changing the temperature set point (just press the button more than once to change the set point). Surprisingly, I didn't see this feature mentioned in any of the product literature.
2) Issue: When setting the unit to "cool", the compressor will *never* come on until the compressor protection interval has expired (five minutes). Answer: I found this to be true only if the compressor has been on within the previous five minutes, so the AC will come on immediately as long as you didn't just turn it off (which is what I would expect).
3) Issue: There is no cycle or "swing" adjustment on the current Honeywell digital thermostats. They are set for a "swing" of plus or minus one degree. Answer: This is true, and there is no direct way to set the swing so you can reduce the amount of cycling of heating/cooling. That said, there is a "heating cycle rate" setting for different types of heating systems (Function 5 in System Setup). This is set to "gas or oil furnace less than 90% efficient" by default, and needs to be changed for electric, hot water, high-efficiency, steam or gravity heating systems. I believe many people will need to change this setting to match their heating system type. Also, if you find that your heating system continues to cycle too often when the thermostat is set to the correct heating system type, you may be able to reduce cycling by choosing a different setting (but only do so at your own risk).
Hope this helps.
Most Recent Customer Reviews
WARNING
I installed 2 of these and both worked fine (one for over a year) Until someone replaced the batteries. Read more
Published 6 months ago by PKT
I have two and love them.
Set them and forget them.
Great sturdy product and very easy to program.
Don't have to be a rocket scientist...
Great sturdy product and very easy to program.
Don't have to be a rocket scientist...
Published 9 months ago by pittpete
abajo los termostatos analogicos
Cuando instalaron la unidad de aire acondicionado en mi casa lo hicieron con un termostato analogico, yo sentia que la misma no rendia lo que indicaba en la potencia nominal del... Read more
Published 10 months ago by Rafael
Terrible Products
I have had to replace two programmable Honeywell thermostats within a year. Because I believed that I just bought a lemon the first tome, I replaced with another, same model. Read more
Published 11 months ago by Dinodon
Programmable Thermostat by Honeywell
Received this product at a great price and very promptly. Been using for some time and it's great and easy to set up and use. I highly reccomend this thermostat and this supplier.
Published 17 months ago by coll0211
Mostly good things to say about this product.
Like the interface. I like that the screen lights ups and the functions are easy to manage. I like the battery compartment being on the side so the batteries can be replaced... Read more
Published 17 months ago by Randolph Phillips
No emergency heat, huh?
This is a great little thermostat if you live in a warm climate. South Carolina to Florida, maybe. Some place where it gets kind of nippy at most. Read more
Published 19 months ago by B. Hepler
Awesome
I have installed five of these thermostats throughout the company. I was very pleased on the ease of installation and programming. Read more
Published 20 months ago by Dean
Works exactly as stated
I have gas heating and electric cooling and installation was quite easy. Took about thirty minutes to replace my non-programmable thermostat. No problems for the last three months.
Published 21 months ago by G.V.Suresh
Solid but loud
Just a quick note for anyone looking at this unit. Three things:
1) Easy to install - nice directions and free label tape
2) Easy to set up - took 5 mintes to follow the... Read more
1) Easy to install - nice directions and free label tape
2) Easy to set up - took 5 mintes to follow the... Read more
Published 21 months ago by andrew shepard
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