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Thermostat and Furnace Compatibility

By Bob Formisano, About.com

7 of 10

Gas Furnace Systems - Low Voltage

Electronic Programmable Thermostat

Electronic Programmable Thermostat

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Type: Gas Furnace - Standing Pilot
Number of Thermostat Wires: 2 or 3; with air conditioning 4 or 5
Voltage: 24 Volts AC
System Attributes: Standing pilot, forced air furnace

Type: Gas Furnace - Electronic Ignition
Number of Thermostat Wires: 2 or 3; with air conditioning 4 or 5
Voltage: 24 Volts AC
System Attributes: Intermittent pilot or hot surface ignition, forced air furnace

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