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  • One program for the entire week-4 periods per day. This product is easy to use
  • Digital display. This product is highly durable and and easy to handle
  • Compatible with heating, cooling and heat pumps without auxiliary heat. Does not work with electric baseboard heat (120-240V) multistage HVAC systems
  • Accurate temperature control of +/-1-Degree F for consistent comfort.Do not use Cooling mode when the outdoor temperatureis below 50 °F (10 °C)
  • Display options: Fahrenheit or Celsius temperature display, 12 or 24 hour clock
  • This product is manufactured in China. Not compatible with electric baseboard heat and multistage HVAC systems

Honeywell RTH221B1021/E1 1 Day Programmable Thermostat


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