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

The Honeywell RTH221B Basic 1 Week Programmable Thermostat is a simplified and easy to use 1-week programmable thermostat. This one-piece thermostat has one hassle-free program for every day of the week. The added bonus of choosing between 4 preset options such as wake, leave, return and sleep add versatility to this programmable thermostat. 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.

  • 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 RTH221B Basic 1 Week Programmable Thermostat Video

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RTH221B1021/A customer reviews

Overall Rating

5 Reviews
5 customers recommend this product
Honeywell RTH221B Basic 1 Week Programmable Thermostat Reviews
Douglas Doherty
December 3, 2020
Verified Purchase
Works great

Easy to install & program. Works as advertised.

Jim Schultz
November 15, 2020
Exactly what we needed

Easy to install, easy to program, easy to understand the directions, simple to use. Only minor complaint is that the thermostat is a little hard to separate from the wall plate. You really have to pry pretty hard. GREAT basic thermostat for the price,

michael derosa
November 13, 2018
Verified Purchase
great tstat

Very good tstat priced under retail stores great and fast delivery

Trevon Gonzales
November 6, 2015
Verified Purchase

Very good and reliable product

Trevon Gonzales
September 14, 2015
Verified Purchase

all in great shape

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