Choose a dual fuel thermostat that supports your system’s heat pump and backup heat source, along with the required number of heating and cooling stages, such as up to three heat and two cool or four heat and two cool. Also consider wiring and mounting requirements, equipment interface modules, indoor air quality controls, remote sensors, and scheduling or connected-control features that fit the installation.

When installing a dual fuel thermostat, verify that it supports the equipment combination, staging, and control functions required by the system, such as heat pump and conventional operation, auxiliary heat, and compatible indoor air quality equipment. Confirm the existing wiring and available power against the thermostat’s terminal requirements, mounting system, and any equipment interface module, because some installations use a common wired connection while others support battery operation or wireless accessories.

Many dual fuel thermostats support remote temperature sensors, humidity monitoring, and indoor air quality equipment, depending on the thermostat and HVAC system. Supported features may include wired or wireless room and outdoor sensors, humidification and dehumidification control, ventilation, and control of compatible indoor air quality devices.

Smart dual fuel thermostats can support weekly schedules, adaptive presets, geofencing, and temperature adjustments from a mobile app or the thermostat itself. Depending on the system, they may also connect with home automation platforms, wireless room and outdoor sensors, indoor air quality equipment, and compatible doorbell video devices for broader control.