We winter in southern California and pass through Arizona in November/December to get there. A couple of comments. Using electricity will not heat the basement area where the water lines are and if you get prolonged below freezing weather this could cause frozen water lines and leaks. Each year we ask our park for the cost of electricity and propane and I run a spreadsheet to see what's cheaper for heating based on an estimated 60% efficiency on the propane side, 100% on electric. I'm betting that the price of propane has jumped based on what's happening in Russia etc. Maybe next winter things will have settled
