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What is the difference between a 'Separate' and 'Integrated' dual-fuel heat pump?



What is the difference between a 'Separate' and 'Integrated' dual-fuel heat pump?

Similar to the separate vs. integrated discussion for heat/cool pairs, a separate backup source for a dual-fuel heat pump indicates there is a separate furnace that is connected to the heat pump via a controller. A dual-fuel heat pump with integrated backup is a heat pump unit with a built-in gas or LPG auxiliary heat source. For modeling purposes, the only real difference is that FEDS will consider replacing the individual components (heat pump or backup furnace) of a separate dual-fuel heat pump in addition to replacing the entire system.

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