– Conventional Heat Pump
• No control at air handler
• Thermostat controlled
– Gas Furnace
• Plenum switch
• Electronic furnace control
• Furnace controlled
– Electric Furnace
• No control at air handler
• Thermostat controlled
– Dual Fuel
• Standard is Manufacturer dependant
• Add-on is Furnace controlled
– MilliVolt
• Typically no fan installed
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