When selecting a thermostat for an ASHP, consideration should be given to the following:

Compatibility: Not all thermostat models are compatible with heat pump system. For instance, most smart thermostats can only be used with centrally ducted ASHPs. In addition, some thermostats may not be able to properly control heat pumps with variable speed compressors. Thermostat specifications should be reviewed to assess compatibility.

Wiring: The wiring required for a heat pump system is different from other HVAC systems. Hence, contractors should ensure that the thermostat under consideration supports the wiring required for heat pumps. Thermostat specifications should be reviewed to assess this aspect of compatibility as well.

Supplementary Heating: Some thermostats support heat pumps but are not compatible with certain types of supplementary heating. Where possible, a thermostat that supports both the heat pump and the supplementary heating system should be selected.