Alright going to rely on the block/radiator water heater with the 38*F switch and a light bulb. I have a battery powered camera to keep an eye on it so once temps get below 38* and I don't see a light, I can go investigate. Will be below zero for 36 hours.

Good thing is I'm in the city on city power; the storage location uses underground power and most the lines here not much trees.