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Honeywell Home

RTH221B1039 RTH221B Programmable Thermostat, White

  • Based on 7,155 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Sep 13
Order within 21 hours and 17 minutes
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Size: 3.5H x 4.75W x 1D (in.)


Style: Thermostat


Features

  • Plastic
  • Imported
  • ONE WEEK PROGRAMMING: Set one identical program for the entire week with four program periods per day including wake, leave, arrive and sleep.
  • PRECISE TEMPERATURE CONTROL: Precise temperature control of plus/- 1 degree Fahrenheit
  • DIGITAL DISPLAY: Easy-to-read digital display with an intuitive interface for one-touch access to setpoint temperature
  • EASY INSTALLATION: Easy to install yourself and basic operation keeps programming simple
  • REMINDERS: Built-in battery change reminders (2 AAA batteries are required for operation)
  • SET POINT RETENTION: Set point is retained in memory in the event of a power outage
  • DISPLAY OPTIONS: Fahrenheit or Celsius; 12 or 24 hour clock. Note: This thermostat is not backlit.
  • OVERRIDE OPTIONS: Permanent and temporary override capability
  • COMPATIBLE WITH: Heating, cooling and heat pumps without auxiliary heat options
  • Does NOT work with electric baseboard heat (120-240 V), heat pumps with backup, or multi-stage heating/cooling. For indoor use only.

Description

This easy-to-operate 1-Week Programmable Thermostat helps make your home comfortable exactly when you want it. Programmable for one week, it lets you customize your schedule with four options – ‘wake’, ‘leave’, ‘return’, and ‘sleep’ – for precise temperature control and added comfort. Simple step-by-step instructions included with the thermostat make DIY installation easy. From the Manufacturer A Honeywell programmable thermostat can save you significant money 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. This one-piece thermostat has one easy program for all days of the week (4 periods - wake, leave, return, sleep). Simple and effective use and performance.

Brand: Honeywell Home


Model Name: RTH221B


Product Dimensions: 1"D x 4.75"W x 3.5"H


Controller Type: Hand Control


Special Feature: Clock Display, Low Battery Indicator, Low Voltage, Programmable


Brand: ‎Honeywell Home


Model Name: ‎RTH221B


Product Dimensions: ‎1"D x 4.75"W x 3.5"H


Controller Type: ‎Hand Control


Special Feature: ‎Clock Display, Low Battery Indicator, Low Voltage, Programmable


Color: ‎White


Specific Uses For Product: ‎Air Conditioner, Furnace


Temperature Control Type: ‎Heating and Cooling


Connectivity Technology: ‎Non-connected


Included Components: ‎Mounting Hardware, Thermostat, User Manual


Power Source: ‎Battery Powered


Voltage: ‎24 Volts


Material: ‎Plastic


Shape: ‎Curved


Display Type: ‎Digital


Finish Type: ‎White


Control Type: ‎Button Control


Control Method: ‎Touch


Mounting Type: ‎Wall Mount


Style: ‎Contemporary


Backlight: ‎Yes


Specification Met: ‎energy


Number of Batteries: ‎2 AA batteries required.


UPC: ‎085267348553


Global Trade Identification Number: ‎53


Manufacturer: ‎Honeywell


Part Number: ‎RTH221B


Item Weight: ‎10.5 ounces


Item model number: ‎RTH221B1039


Batteries: ‎2 AA batteries required.


Is Discontinued By Manufacturer: ‎No


Size: ‎3.5H x 4.75W x 1D (in.)


Finish: ‎White


Pattern: ‎Thermostat


Item Package Quantity: ‎1


Cutting Diameter: ‎1.1 Inches


Special Features: ‎Clock Display, Low Battery Indicator, Low Voltage, Programmable


Batteries Included?: ‎No


Batteries Required?: ‎Yes


Battery Cell Type: ‎Alkaline


Warranty Description: ‎1 year limited.


Assembled Diameter: ‎1.1 Inches


Date First Available: August 17, 2005


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Sep 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Great value for a programmable thermostat ~ easy install
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
Review Image by Mark from Texas Mark from Texas
Review Image by Mark from Texas Mark from Texas
This is programmable thermostat works as it should. This installation is very easy, less than 5 minutes connect it. Instructions are provided and are easy to follow. It is small and the screen is small and it is not backlit. It does everything I need it to. I would recommend it for the price point. You can’t beat it. I am not an electrician or A/C man, easy diy project. ... show more
Reviewed in the United States on June 4, 2025 by Mark from Texas Mark from Texas
    • It does the job it’s intended for.
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
This arrived quickly. I had no issues installing it even though my home has older wiring-it was built in 1930. I previously had an ancient thermostat-one that used mercury. Installing this newer model thermostat has been great. It keeps the temperature steady & can be programmed when you know you’ll be away from home awhile. It was inexpensive, yet it works great. ... show more
Reviewed in the United States on June 29, 2025 by Lacey M. Morman
    • Work well
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
I have 2 of these in my home they are easy to program, easy to adjust, and work very well. I wish they were backlit so you could see them in the dark and better during the day.
Reviewed in the United States on July 1, 2025 by Jeff
    • Good, easy, basic.. time tested
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
Heat, cool, fan. Temperature up or down. Basic good thermostat, do not set a program on these its annoyingfor techs... Use for basic units. Only can use with single stage forced air units or heat pumps but only without auxiliary heat. If you aren't sure you have auxiliary heat you do if your energy bill is really high in colder months ( kind of a joke there ) auxiliary heat is at the furnace and is pretty much a heating coil that a dryer similary. It's a coil that gets red hot when your heat pump can not keep up helping heat your house it is similar to emergency heat. Anyway this thermostat is easy to install and is a good basic thermostat for your house. I buy these frequently for side jobs. If they want to upgrade to a fancy wifi remote activated thermostat down the road I will also install those but they definitely have more issues in my experience anyway. Recommend if you are good with walking to your thermostat to adjust the temperature of your house ... show more
Reviewed in the United States on July 3, 2025 by todd
    • I'm sure it's a great product, as this is a reputable company
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
I'm sure it works great, I just ended up not needing it. I bought it to rule out the existing thermostat as the culprit to my AC issues, but discovered while flipping the breaker which the breaker box is directly next to the AC unit, that the AC unit has a compressor leak as soon as I kicked it back on. Nice cold air coming from the outside box. Hot air from the vents inside. Blower also works fine. I figured it out before this even arrived so I just turned it around and sent it back. I need an hvac guy. Not a thermostat. Good thing I know one and have evaporative cooling to hold us over in the meantime. ... show more
Reviewed in the United States on June 18, 2025 by Wine is fine but WhiskeysQuiker
    • Overall decent
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
Easy to install and works great, material seems a little cheap but as long as it works I'm happy
Reviewed in the United States on July 6, 2025 by Ayla
    • Didn't get to open it, so more of a review on the product itself having had one before.
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
I didn't get to use it. I know since I had one before how good these are, even though they do look cheaper than other newer models, these get the job done and work well. Unfortunately, what I thought was a failing thermostat was actually a failing hvac unit... so I now have this back up if I want to replace the one that came with the new set up. Can't go wrong with this brand. Product did arrive in box, new, as advertised and all of that. Quickly, as well. ... show more
Reviewed in the United States on June 3, 2025 by U37d72nd
    • Grrrr!
Size: 3.5H x 4.75W x 1D (in.) Style: Thermostat
There was nothing wrong with my old thermostat except that it didn't indicate the temperature in the house and it needed electricity to operate. I bought this thermostat because it was inexpensive and I wanted a battery backup model so I wouldn't be without heat if the power goes out. I liked that the display was an innocuous gray instead of glaring green or brilliant blue like other thermostats. After having to read the manual to figure out how to set the thermostat to a constant temperature - something I think should be pretty easy to do without reading a manual, I found that this thermostat turns my heater on before the temperature drops to the programmed setting, then it runs the furnace constantly compared to my old manual thermostat set at the same temperature. With this thermostat, the heater runs and runs for approximately 15 minutes at a time (compared to my old thermostat that only ran my heater a few minutes). When the thermostat finally turns the heat off, it registers much higher than the temperature I set it to. If I lowered the setting, my house got much colder than I was used to before my heater turned on and my house still got way too warm by the time the thermostat turned my heater off. Why should I get uncomfortably cold because the thermostat doesn't kick on, then have to pay to heat my house to an uncomfortably warm temperature? I could tolerate a thermostat that is off by a degree or two, but heating to more than 5 degrees above the set temperature is not acceptable. If I had kept this thermostat, I'm sure my heating bills would have skyrocketed. Plus, I had to pay my handyman to install this piece of junk and I had to pay him to uninstall it and reinstall my old thermostat. Now that my old thermostat is reinstalled, the heater runs way less frequently than with this thermostat AND the temperature in my house doesn't fluctuate between being too cold and too warm. I definitely won't be buying another Honeywell product in the future. ... show more
Reviewed in the United States on February 2, 2024 by Amazon Customer

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