Rheem 400 Series Thermostat

The Contour of Comfort

Rheem has set a new industry benchmark for Home Comfort with the 400-Series blue touchscreen thermostat, specially designed to work with Rheem Prestige Series® modulating gas furnaces. Plus, it’s designed to be easy-to-view, easy-to-understand and easy-to-operate with simple on-screen programming

Features & Benefits

  • Bright, 12 sq. inch lighted display (412 & 422 models have lighted touchscreen display)
  • Keypad lockout option
  • Hardwired
  • Easy, menu-driven programming
  • Audio prompting to ensure program change confirmation
  • Intuitive red/blue temperature keys
  • Call for service prompt
  • Humidification and dehumidification control


  • Universal – installer selectable system applications
  • Universal – choice of 7 day, 5/1/1 day programmable or non-programmable
    (installer selectable)
  • 4 time and 4 temperature settings per program (2 setbacks) heat and cool, or selectable – 2 time and 2 temperature settings (1 setback)
  • Energy savings up to 33%
  • Patented pre-programmed schedule simplifies time and temperature programming


  • Large 12-square-inch touchscreen display – largest in the industry
  • Blue, lighted display for easier low-light viewing
  • Larger, easy-to-read character size
  • Extra-large touch keys for easy operation
  • Clean, uncluttered touchscreen display provides easier navigation
Model Performance Application Power Source
RHC-TST412MDMS Modulating Furnace /2-Stage Cooling Gas/Oil/Electric/Heat Pump
RHC-TST422DFMS 4-Stage Heat/
2-Stage Cooling
Gas/Oil/Electric/Heat Pump/Dual Fuel Battery/Hardwired

5 years from date of purchase.