I have 2 heat pumps and if I have to replace, will most likely not go with heat pumps. I prefer to use a ceramic at each end, and an oil filled radiator mid-ship, so the extra cost isn't worth it for me. Mine also has 2 gas furnaces, which love to burn propane, so only on the coldest of trips do I use them.
BTW: We camp year around in the coldest of winters.
Unlike Bumpy, I prefer my homes heat pump, supplemented by a propane fire place. My old home had gas forced air, and my wife and I could not stand the 120 + degree air when the heat was on. With the heat pump it pretty much follows the 20 degree split rule, so if the air is 68 the heat is 88. On real cold days, when the resistance heat kicks in, then we see similar spikes, but I usually have the fireplace "fired" up.