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Thermostat and Furnace Compatibility

By Bob Formisano, About.com

10 of 10

Heat Pump Systems


Type: Single Stage Heat Pump
Number of Thermostat Wires: 4 or 5
Voltage: 24 Volt AC
System Attributes: Outdoor heat pump unit providing heating and cooling


Type: Multi-Stage Heat Pump
Number of Thermostat Wires: 7 or more
Voltage: 24 Volt AC
System Attributes: Outdoor heat pump unit providing heating and cooling

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