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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.

1-Week Programmable Thermostat

The Honeywell RTH221B Basic 1 Week Programmable Thermostat has one hassle-free program for every day of the week. It is programmable for one week with four options: wake, leave, return and sleep to customize your weekly schedule. Also, it has precise temperature control for added comfort. The Honeywell Basic 1 Week Programmable Thermostat utilizes a crystal clear digital display that allows for precise temperature control. This thermostat is compatible with heating, cooling and heat pumps without auxiliary heat options. Verify compatibility with your home's heating and cooling system, remove your existing thermostat and follow step-by-step instructions that come with the thermostat for simple DIY installation. Features include: Simple programming (one program for entire week, plus four options per day), Easy to use, Precise temperature control, One-year warranty & Easy DIY installation.

  • 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
Product Details
Product Specs
Product Manuals
Honeywell Home RTH221B 1 Week Programmable Thermostat Video

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RTH221B1039/E1 customer reviews

Overall Rating

1 Reviews
1 customers recommend this product
Honeywell Home RTH221B 1 Week Programmable Thermostat Reviews
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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