Thermostat Wiring

Thermostat Wiring Diagrams! 10 Most Common!

Heat Pump Thermostat Wiring Explained! Colors, Terminals, Functions, Voltage Path!

Most Common Thermostat Diagrams

Wiring Diagram 12 new.png

1 Heat / 1 Cool Thermostat

Furnace and AC

Wiring Diagram 16 color.png

1 Heat / 1 Cool Thermostat

Furnace and AC

(color coded)

Wiring Diagram 13 newest.png

1 Heat / 1 Cool Thermostat

Furnace (No AC)

Wiring Diagram 4 new.png

1 Heat / 1 Cool Thermostat

Air Handler and AC 

Wiring Diagram 5 new.png

Heat Pump Thermostat

Air Handler and AC  

Wiring Diagram 17 newest.png

Heat Pump Thermostat

Air Handler and Heat Pump

Wiring Diagram 8 new.png

Heat Pump Thermostat

Air Handler, Heat Pump, Electric Resistance 

(Reversing valve powered in cooling mode)

Wiring Diagram heat pump 2.png

Heat Pump Thermostat

Air Handler, Heat Pump, Electric Resistance 

(Reversing valve powered in cooling mode, color coded)

Wiring Diagram 10 new.png

Heat Pump Thermostat

Air Handler, Heat Pump, Electric Resistance 

(Ruud and Rheem, reversing valve powered in heating mode) 

Wiring Diagram 1 new 2.png

1 Heat / 1 Cool Thermostat

Air Handler, AC separated from Furnace, Rc and R jumper removed

 

Wiring Diagram 2 new.png

1 Heat / 1 Cool Thermostat

Air Handler, AC, and Boiler,

Rc and R jumper removed 

Wiring Diagram 18 new.png

750 Milli-Volt Thermostat

750 MV Thermopile and Gas Valve

Wiring Diagram 19 new.png

1 Heat / 1 Cool Thermostat

Air Handler with Electric Resistance Heat and AC

Wiring Diagram 20 new.png

Heat Pump Thermostat

Air Handler, Electric Resistance Heat, and AC