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You're only going to need a gas furnace (vs an efficient electric heat pump) in climates where it dips below 10F and an air or ground source heat pump would need to call on auxiliary heat to keep a dwelling warm (unless you live in a newer home with a very tight envelope and little unassisted air exchange occurs).

To your point, you can purchase very efficient gas furnaces, but they're more expensive and require a retrofit of the flue pipe to PVC due to corrosive properties of high efficiency furnace exhaust (not a concern in new construction).


Air source only heat with a heat pump is a slam dunk anywhere south of the 36°30′ parallel, and all of California.


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