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HVAC SYSTEM COMPATIBILITY
SYSTEM TYPE COMPATIBILITY MODIFICATIONS
Conventional heating and
cooling
• Gas furnace
• Air conditioner
• Electric furnace
• Boiler
Yes None
Heat only
• Gas furnace
• Electric furnace
• Boiler
Yes Requires a common
wire (c-wire)
Cool only
• Air conditioner
Yes Requires a common
wire (c-wire)
Heat pump Yes Requires a common
wire (c-wire)
Communicating
proprietary systems
No Needs standard HVAC wiring
Line voltage No Requires low voltage
(20-30VAC)
Millivolt systems No Requires 20-30VAC
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