Good one.
We have had heat pumps all along. Close to ocean so salt eats them up so just put in our second replacement. Kilo usage dropped quite a bit albeit the SEAR stayed the same. Monthly average dollar usage is 225 up from 175 over past 18 months or so. Frankly not too concerned about that. Food costs are another matter. Insurance, forget it. Doubled in two years. Major dollars there...1400 to 3500 for house.
My sister has a condo on the outer banks near Atlantic Beach and she talks about her heat pumps not lasting long in the salt air. If we use he condo she tells us to move the temperature settings in 1-2 degree increments over several hourly periods. She’s had this condo which she doesn’t rent out to anyone, just allows immediate family to use for about a decade. Her kids are now grown and she’s getting ready to sell it I suspect.