The average thermostat most people encounter is designed for an HVAC system that controls the fan, power, cool, and heat. There are four wires with this type of thermostat. But a heat pump needs a special thermostat with five wires.

The fifth wire in a heat pump thermostat is the reversing or changeover wire, which controls the reversing valve, allowing a switch between heating and cooling. This wire is not an AC wire and care should be taken with connections.

Additionally, there may be an emergency wire to cut off the heat pump when needed. Also, many thermostats for heat pumps are designed to be energy efficient, leading to a lower energy bill than when using a standard central furnace.

Do your homework before settling on a new thermostat for your heat pump. Know what your lifestyle needs are, consider average temperatures, energy costs, and how your choice of thermostat model will impact your aesthetics.

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