Honeywell 1-Week Programmable Thermostat RTH221B1039

2 items left


Easy to use thermostat for low volt heating/cooling systems

Our 1-Week Programmable Thermostat is easy to use and compatible with low volt heating/cooling system, including millivolt and single-stage heat pumps without auxiliary heat. It features simple programming. Just program the entire week. If necessary, you can also program up to four periods per day like sleep, wake, leave and return.


  • Simple programming (one program for entire week, plus four periods per day)
  • Easy to use
  • Precise temperature control
  • Sleek one-piece design
  • DIY installation


  • Stages: Single Stage Heat and Cool, Heat Only or Cool Only
  • Programmability: One program for entire week, plus four periods per day
  • Compatibility: Gas, oil or electric furnace , Central air conditioner, Hot water system with or without pump, Millivolt system , Central heating and cooling system, Heat pump without auxiliary/backup heat