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Honeywell RTH6400D 5-1-1-Day Programmable Thermostat

83 customer reviews
| 5 answered questions

List Price: $69.99
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Home Thermostat Replacement

What's included See more details
  • Installation of 1 customer-supplied thermostat
  • Proper disposal of replaced thermostat
  • Testing new thermostat for proper function
  • Instructions on proper use

How it works
  • Pro will contact you within 1 business day to schedule
  • Kick back and only pay when the job is done
  • Backed by Amazon's Happiness Guarantee

PDK Home Solutions will contact you within 1 business day to schedule an appointment.
Fulfilled By: PDK Home Solutions
93% positive ratings (28 reviews)
  • Enter your model number above to make sure this fits.
  • Large backlit display with soft-touch button interface
  • Precise temperature control of plus-or-minus-degrees Fahrenheit with auto change from heat to cool
  • 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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This item: Honeywell RTH6400D 5-1-1-Day Programmable Thermostat
Customer Rating 4 out of 5 stars (83) 4 out of 5 stars (271) 4 out of 5 stars (393) 4 out of 5 stars (357)
Price $59.99 $47.19 $59.00 $55.95
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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.

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

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). 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.

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 Information

Technical Details
Part Number RTH6400
Item Weight11.5 ounces
Product Dimensions3.2 x 9 x 8.2 inches
Item model numberRTH6400D
Discontinued by manufacturerYes
Item Package Quantity1
Display StyleDigital
Batteries Required?Yes
Warranty Description1 Year Product Warranty
Additional Information
Best Sellers Rank #342,972 in Home Improvement (See top 100)
Shipping Weight12.8 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableAugust 17, 2005
Warranty & Support

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

Customer Reviews

Most Helpful Customer Reviews

40 of 42 people found the following review helpful By illbwolf on December 20, 2008
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.
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22 of 22 people found the following review helpful By Peter on May 1, 2010
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).
Read more ›
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20 of 20 people found the following review helpful By D. W. Pieper on February 15, 2009
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.
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16 of 16 people found the following review helpful By Laura on June 14, 2009
Verified Purchase
I installed the thermostat today and it took me 4 hours. I had 2 additional wires that it didn't cover in the directions. The R wires and the jumper was a bit vague and I had an O & W wire for the same location on the unit. I had to trial and error it for a bit and when I did get it to work initially it came out as heat (not good when it was already 85 in the house here in central Florida). I finally swapped the O for the W and had to wait a few minutes for the unit to come on and make sure it was on for Cold. Finally it was. Having a heat pump makes installation trickier than the regular installs. If someone is having a problem with the heat pump install, keep the jumper in, red wire goes to the 2nd from the right, and use the O not the W wire.
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11 of 11 people found the following review helpful By RedRocker on December 2, 2009
Verified Purchase
I'd give this product a five, but the instructions say to line up the wires with the colors, and if you do that, you won't get heat. For some reason, the Yellow wire goes in the "W" (for white) slot, and the directions don't tell you that. Had to have a heating guy come out and figure out what was wrong.

Other than that, it's simple to use, much moreso than the 7 day thermostat from Honeywell, which takes an engineer to program (that model's only advantage is that it automatically keeps track of Daylight savings time, and contrary to its advertising, it still requires a battery). Programming on this model consists literally of pushing the same button again and again to cycle through your programming, and you need only hit the up/down buttons to change time and temp. Couldn't be easier. I've ordered two more.

Also, ontrary to what one reviewer said, pushing the button at night to get the backlight to turn on does NOT change the setting. You have to hit the button twice to do that. Night viewing is easy to read.
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8 of 8 people found the following review helpful By Schlermie on November 7, 2009
This is a pretty good no-frills thermostat. It was easy to install, and I have no complaints about it. The interface is easy to use and intuitive. The display is well laid out and full of good information, also making it easy to use. The Amazon feature list is incorrect about one item though. This thermostat does not have a "filter change reminder".
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