iO HVAC Controls iO-DFK Dual Fuel KitiO HVAC Controls iO DFK Dual Fuel Kit Description This easy to install Dual Fuel Kit can be used with heat pumps and fossil fuel furnaces having up to 4 stages of heating and 2 stages of cooling. They work by turning the heat pump off at a pre determined outdoor temperature permitting the fossil fuel furnace to run in order to reach the room thermostat setpoint. Includes snap track mounting and outdoor balance point thermostat. Features and Benefits
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