Honeywell RTH6400D 5-1-1-Day Programmable Thermostat | 
 enlarge | Brand: Honeywell
Category: Home Improvement
List Price: $69.99
Buy New: $43.70(as of 9/9/10 06:19 PDT - Details)
You Save: $26.29 (38%)
New (6) Used (2) from $43.70
Rating:  71 reviews
Sales Rank: 3143
Color: White
Media: Tools & Hardware
Number Of Items: 1
Size: Large
Shipping Weight (lbs): 0.7
Dimensions (in): 10 x 8.4 x 1.9
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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| Editorial Reviews:
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 66 more reviews...
 Works exactly as stated August 28, 2010
G.V.Suresh (Rockville, MD, US)
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.
 Solid but loud August 8, 2010
andrew shepard (Winchester, MA, US)
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 directions
3) Very loud - wake up in the middle of the night loud
Allow me to highlight the last item. This was purchased for our bedroom and the unit was so loud that I switched it with the Hunter unit we had in the livingroom. I would guess that the solinoid will last forever, but it is loud when it switches on and off. The cheap HomeDepot unit this replaced did die, but atleast it was quiet while it lasted.
 Energy Star Rating For This Product Should Be Removed August 5, 2010
John Izydorczyk (Tampa, Florida)
Although many reviewers think these Honeywell thermostats are great, in actually, this, and the entire family of Honeywell thermostats, are the worse thermostats on the market. Why? Their temperature differential, that is their differential point at which they turn "on" and turn "off", is a mere +/- .25 degrees and unlike many other thermostats, including the old mercury thermostats, it is completely unadjustable. In other words you are stuck with the build in +/- .25 degrees. What this tight differential causes is frequent cycling from "on" to "off" of compressors - and this is extremely bad for the life expectency of the compressor. Also, frequent (as in every 5 minutes when the inside and outside temperatures are close) cycling is very inefficient. Air compressors do not reach their maximum efficiency until they remain on for about 10 minutes. In most cases, this thermostat will turn off the compressor in 5 minutes and back on in 5 minutes. When their is a small difference between inside and outside temperatures (and this occurs frequently), properly adjusted thermostats will cycle on about once an hour and more importantly, once the compressor turns on, it will stay on for a minimum of 12 minutes, for example, on 12 minutes and off 40 minutes. This thermostat will instead, cycle on and off about 4 times in one hour when their is a small difference between indoor and outdoor temperatures. Personally, I believe that these Honeywell thermostats should not be allowed to display the "Energy Star" rating - and I stake my reputation on that. I will say this, if all you are interested in is keeping your home at the set temperature with extremely little variation, and you do not care how much energy it takes to do it nor how long your air conditioner will last, then Honeywell thermostats are great for you.
What to do? Purchase a thermostat with a build in temperature differential of at least +/- 1 degree, or better yet, purchase a thermostat with an adjustable differential, they do exist.
 very happy with it so far! June 13, 2010
Pampeliska
1 out of 1 found this review helpful
I have used previously another (non-programmable) Honeywell model (the RTH5100B 1009) and was absolutely satisfied with it. It never needed any maintenance or attention, other than changing batteries once or twice in the course of four years.
This year I decided I needed programmable thermostat, so I can regulate A/C better during the night. I live in hot, humid climate, and during the night the A/C is complete life-saver... except that no matter how low I set it in the evening, it inevitably stops running somewhere in the middle of the night, making eventually the air in my upstairs bedroom way too hot and un-breathable - necessitating at least one, sometimes two trips each night, trudging down the stairs, lowering the temperature to get some fresh air and trekking back up... it does get pretty annoying after a while.
This programmable unit has completely solved my problem, as I can set it up to gradually (and automatically) lower the temperature during the night, making the air conditioner kick in periodically and supplying me with fresh air the whole night.
My friend did the set-up, and since the previous model was Honeywell as well, switching everything to this model was a breeze.
Since its installation last month, this thermostat has worked like a magic... keeps the temperature accurate and even, programming is very easy and works dependably, and most of all - it saves me daily frustration of waking up each night and having to adjust temperature manually.
Very happy with this purchase and highly recommend!!
Thermostat Honeywell May 14, 2010
John C. Margo (Houston)
Great price for item manufactured by an outstanding company & sold at much higher prices in major hardware store,s etc.
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