Therefore, while the air conditioner is used extensively in warm or hot weather, the heat pump is used year-round. While an air conditioner uses the process of refrigeration to only cool, the central air conditioner will usually be paired with a gas furnace, an electric furnace, or some other method of heating. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and cool. Thermostat Wiring Diagrams for Heat Pumps - Heat Pump Thermostat Wire Diagrams

C Terminal is connected to the Blue wire many times referred to as the C Wire - this is normally used for common and completes the circuit between R and C with the thermostat being the load for a basic circuit.

W Terminal is connected to the W Wire or White Wire - This is for the heating circuit and control heat.

Y Terminal is connected to the Y Wire or Yellow Wire - the yellow wire is for cooling and originates at the thermostat, runs to the air handling unit, and then to the condensing unit outside.

G Terminal is connected to the Green Wire or G Wire - This is for the blower fan in the air handler.

Origin is the control transformer and then the R Terminal.

R Terminal is Connected to the Red Wire or R Wire - this is 24-volt power for the thermostat and controlled devices.

Lastly, whenever in doubt call a professional.Īir Conditioner Thermostat Wiring Details and Color Code Or to at least be aware that the system has dual transformers.

The heating system could also be a boiler, however, is it necessary to ensure with split systems and the type of heating systems described that you do not have dual transformers in the system. Finally, the third thermostat diagram showing the average type of split system with an air conditioner or gas or oil furnace used for heating. The second wiring diagram showing a heat pump system. With the top thermostat wiring diagram showing an air conditioning system.

An air conditioner cooling system is different than a heat pump heating and cooling system. Lastly, these thermostat wiring diagrams will help you wire a new thermostat. Either of these can be a regular digital thermostat or a programmable thermostat. The charts listed here will help you with a heat pump thermostat and an air conditioner thermostat. Additionally, before you decide to change your thermostat, make sure you have the correct tools especially a screwdriver and wire pliers. Thermostat Wiring Diagrams - Heat pumps are wired for HVAC control far differently than air conditioning systems so make sure you know the difference and correctly identify the type of HVAC system you have installed.

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