Thermostat Wiring

Thermostat wiring diagram

Below are the most common thermostat wiring diagrams, along with in-depth video explanations for wiring thermostats in a range of HVAC systems.

Videos

Most Common Thermostat Diagrams

  1. 1 Heat / 1 Cool Thermostat — Furnace and AC
  2. 1 Heat / 1 Cool Thermostat — Furnace and AC (color coded)
  3. 1 Heat / 1 Cool Thermostat — Furnace (No AC)
  4. 1 Heat / 1 Cool Thermostat — Air Handler and AC
  5. Heat Pump Thermostat — Air Handler and AC
  6. Heat Pump Thermostat — Air Handler and Heat Pump
  7. Heat Pump Thermostat — Air Handler, Heat Pump, Electric Resistance (reversing valve powered in cooling mode)
  8. Heat Pump Thermostat — Air Handler, Heat Pump, Electric Resistance (reversing valve powered in cooling mode, color coded)
  9. Heat Pump Thermostat — Air Handler, Heat Pump, Electric Resistance (Ruud and Rheem, reversing valve powered in heating mode)
  10. 1 Heat / 1 Cool Thermostat — Air Handler, AC separated from Furnace, Rc and R jumper removed
  11. 1 Heat / 1 Cool Thermostat — Air Handler, AC, and Boiler, Rc and R jumper removed
  12. 750 Milli-Volt Thermostat — 750 MV Thermopile and Gas Valve
  13. 1 Heat / 1 Cool Thermostat — Air Handler with Electric Resistance Heat and AC
  14. Heat Pump Thermostat — Air Handler, Electric Resistance Heat, and AC

See also the HVAC Electrical Training Board and the Thermostat Function Quiz.

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