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  • Simply Programming - one program for the entire week, up to 4 periods per day.
  • Set desired temps for 4 periods - wake, leave, return, and sleep.
  • Precise temperature control of +/-1 Degree Fahrenheit for consistent comfort.
  • Easy to read digital display - Fahrenheit or Celsius temperature, 12 or 24 hour clock.
  • Do-it-yourself installation capability - compatible with heating, cooling and heat pump without auxiliary heat.
  • Does not work with electric baseboard heat (120-240V) multistage HVAC systems.

Easy Programming for Week Long Comfort

This user-friendly thermostat simplifies scheduling your home's temperature throughout the week. Set up one program for all seven days, with four customizable settings for wake, leave, return, and sleep. The Honeywell RTH221B boasts precise temperature control, keeping your home feeling exactly how you like it. A clear digital display makes it easy to adjust settings and monitor temperature. Installation is a breeze for most DIYers – simply verify compatibility with your system, remove your old thermostat, and follow the included step-by-step guide.

Simple One-Week Programming

Schedule your ideal temperature for the entire week with four customizable settings per day.

Easy to Use

Enjoy a user-friendly interface with a clear digital display.

Precise Temperature Control

Maintain consistent comfort with accurate temperature regulation.

DIY-Friendly Installation

Follow the included instructions for a straightforward installation process (check compatibility beforehand).

  • Heating Only: Yes
  • Cooling Only: Yes
  • Compatible with Warm Air Furnace: Yes
  • Compatible with Central Air Conditioning: Yes
  • Compatible with Hot Water: Yes
  • Compatible with Steam or Gravity: Yes
  • Use with Floor/Wall Furnace 24V or 750mV: Yes
  • Use with Volt Gas Fireplace 24V or 750mV: Yes
  • Use with Pellet Stove for mV Thermostats: No
  • Use with Electric Baseboard 120V-240V: No
  • Single-Stage Heating: Yes
  • Single-Stage Cooling: Yes
  • Multi-Stage Heating: No
  • Multi-Stage Cooling: No
  • Compatible with Heat Pump (No Aux.): Yes
  • Compatible with Heat Pump (No EM): No
  • Compatible with Heat Pump (With Aux.): No
  • Compatible with Heat Pump (With EM): No
how do I reset my Honeywell Non-Programmable Thermostat?

To reset this Honeywell Thermostat, you can follow these steps:

  1. Turn off the power to your heating and cooling system.
  2. Remove the thermostat from its wall plate.
  3. Wait 30 seconds.
  4. Reattach the thermostat to the wall plate.
  5. Turn the power back on to your heating and cooling system.
Product Details
Product Specs
Product Manuals
Honeywell Home RTH221B 1 Week Programmable Thermostat Video

If you are interested in ordering a large quantity of items you may qualify for volume pricing discounts. Volume Discount Pricing is a great way for customers to save big on large, bulk orders of most items available in our store. Please send a bulk order request to our friendly sales staff so they may create a quote and provide personal service for your order! You will receive a response within 1-2 business days and our office hours are Monday through Friday, 8am-5pm CST.

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RTH221B1039/E1 customer reviews

Overall Rating

2 Reviews
2 customers recommend this product
Honeywell Home RTH221B 1 Week Programmable Thermostat Reviews
Carla at PGM
June 11, 2024
Seamless, Secure, and Significant Savings: Exceptional Experience with Honeywell Store

Absolutely stellar experience with Honeywell Store! I recently purchased a substantial number of thermostats for an apartment community and had them shipped to a property in another state. From start to finish, the process was seamless. There was no delay in shipping, which was incredibly important for our project timeline. The online payment process was secure and straightforward, giving us peace of mind. On top of all this, we received a significant discount by ordering in bulk, which was a fantastic bonus. Honeywell Store exceeded our expectations, and we couldn't be happier with the service. Highly recommended!

February 26, 2024
Honeywell to the rescue

Honeywell programmable thermostat Is the best went from burning 100 gallons a week down to 35 gallons a week Our boiler is now burning less oil on a efficient schedule, Thanks Honeywell

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