“I live it. I know.”
Using Denver data.
A gas furnace will deliver one million BTUs for a fuel cost of $18.
A 3 COP rated heat pump will deliver that amount with a fuel cost of $12.
Dead wrong. You didn’t take ambient temperature into account. They fall off sharply below 32 degrees and you have to inject heat into the air just to have it drawn out by the heat pump.
That $6 difference doesn’t mean jack in the face of one simple thing: if power goes out, you have no heat. But that gas still flows, even without electricity.
In a windy place where blackouts happen on a not infrequent basis, going to all electricity to replace gas is zaniness.