Honeywell RTH6400D 5-1-1-Day Programmable Thermostat | 
 enlarge | Brand: Honeywell
Category: Home Improvement
List Price: $69.99
Buy New: $50.99(as of 3/9/10 08:43 PST - Details)
You Save: $19.00 (27%)
New (8) from $50.99
Rating:  65 reviews
Sales Rank: 1447
Color: White
Media: Tools & Hardware
Number Of Items: 1
Size: Large
Shipping Weight (lbs): 0.7
Dimensions (in): 3.3 x 9 x 8.3
MPN: YRTH6400D1000
Model: RTH6400D
UPC: 085267497886
EAN: 0085267497886
ASIN: B001FWZ7I2
Availability: Usually ships in 1-2 business days
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| Features:
| • | Large backlit display with soft-touch button interface | | • | Precise temperature control of plus-or-minus-degrees Fahrenheit with auto change from heat to cool | | • | Energy Star Rated 5-1-1 programming with 4 programmable periods per day | | • | Exclusive Honeywell Smart Response Technology and filter change reminder | | • | Compatible with heating and cooling system plus single stage heat pump systems |
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Product Description
Programmable 5 1 1 day with 4 program periods per day. For heating and air conditioning systems. Large backlit display with menu driven programming. Soft key controls. Shows room and set temperature. Exclusive Smart Response technology. Compatible with most electric, gas oil single stage furnaces; heat pumps without backup heat; heat only, and cool only furnaces. Will not work on electric baseboard heat. Precise temperature control + 1 F. Automatically switches from heat to cool to adjust the preheating cooling of your home so you can feel comfortable at your programmed times. Battery powered. Approximate size: 3.75'' H. x 6'' W. x 1.25 W. Off white. ENERGY STAR rated.
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, and it is Energy Star rated for efficiency you can count on.  | The RTH6400D 5-1-1 Programmable Thermostat offers: - Separate programming for weekdays, Saturdays, and Sundays
- Effective energy expense savings
- Backlit display and easy push-button design
- Intuitive adjustment for precise comfort control
- Compatibility with a range of heating and cooling systems
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 | 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. 
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. |
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. 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). And it is ENERGY STAR rated in recognition of its energy saving capability. 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
With personalized temperature control, your household enjoys comfort day and night. |
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| Customer Reviews: Read 60 more reviews...
 Auto Changeover Makes This a Winner! February 10, 2010
R. Barrett (St Augustine, United States)
We have two heating/cooling systems, one for each level of the home. Last month I bought a Lux 1500 based on the excellent reviews it got from Consumer Reports and Amazon reviewers. However, it had one huge failing--no auto changeover! In my research I missed this because I thought every programmable thermostat had auto-changeover.
So, I set out to find a better unit, and came across the Honeywell 6400. Ordered it, installed it (15 minutes), set it up for auto-changeover, and I couldn't be happier. This thermostat is fantastic. And it tells you at a glance BOTH the actual temp and target temp for the room, something else the Lux doesn't do.
The only feature I can imagine wanting that this unit doesn't have is a vacation mode... but really, that's pretty easy to achieve by just switching to a manual heat or cool mode and setting the temp manually.
I have recommended this unit to several friends already, and at only $50, my experience is that it will easily pay for itself in a couple of months.
Save $ now on your heating bill February 5, 2010
Joseph A. Beck (Fishtown, USA)
You can realize some significant cost savings by installing this thermostat and lowering your temperature at night and while you are at work or away from home. I saved 40% on my heating bill this month, compared to last year when I had a mercury thermostat.
 Easy to program and easy to use. January 25, 2010
Paul Brown (Naperville, IL USA)
I bought this to replace an other Honeywell, which was a non programable unit. So far i have to say it does exactly what it claims to do. Makes the house warm in the daytime and cold at night! (joke) It's easy to program and easy to use, the only complaint i have is the quick reference guide, that is supposed to be slipped into a pocket at the back of the device just doesn't fit well. Once i got it in there i couldn't get it out again without ripping it. No biggie, but annoying.
As for savings, here's hoping. I haven't had the unit long enough yet to see if it has made a difference, but i can't see how it wouldn't. I'll update the review once i find out.
Just what I was looking for December 25, 2009
Vincent D'Amico (Boston, MA)
I replaced an old mechanical thermostat with this unit. What a difference! It does a terrific job of controlling the room temperature. There are 2 programmable cycles. I have it warm up the house early in the morning. It then cools things down while we are at work. It warms it back up in time for our return in the evening. Late at night, back down to conserve energy.
Weekends are separately programmable so you stay warm for longer periods of time.
My only criticism is that programming the temperatures is a serial process. In other words, you cannot select any time period to reprogram, you must step through all the cycles. Not a big deal really considering that there is a manual override if you are home unexpectedly and there is a vacation override as well.
 No Differential Temperature Control December 17, 2009
T. Swanson (Phoenix, Az.)
4 out of 5 found this review helpful
I had a Lux digital Thermostat for my heat pump and thought I would upgrade to a Honeywell RTH6400. I immediately noticed the heat pump was turning on for 8 to 12 minutes, and off for 6 to 9 minutes repeatedly. I looked at the temperature change on the digital display and it never changed, but remained constant at 72 degrees. The display changes from 72 to 71 degrees when the temp falls below 71.5 degrees and increases to 73 degrees when higher than 72.5 degrees. Since the display always says 72 degrees, it means the thermostat is turning on at 71.5 degrees and turning off at 72.5 degrees. This means the RTH6400 has a plus or minus half degree temperature differential not a plus or minus 1 degree as I have read elsewhere. Then I read the manual and could not find out how to change the temperature differential. So I called the tech support, who sounded like he was in India, and after explaining what I wanted to do 4 times he finally told me, No you can not do that." Turning the heat pump on and off like this is very inefficient, wastes electricity and money, and probably reduces the lifetime of the compressor. I just threw money away not only buying this thermostat but even more by using it for the last month. I think another Lux or maybe a Robertshaw is going to be mounted on my wall in a few days.
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