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by RatchetWerks 317 days ago
It was already answered, but conventional AC systems have resistive heating elements which have a a max efficiency of 100 percent.

Heat pumps run an AC in reverse which can give a COP of 3-4. (300 to 400 percent efficiency)

or if actually burning fuel for heat. Could just remove the need for direct fuel burning altogether. Highly dependent on area, and associated costs. I recommend that you run the numbers for your area