I'm up off the ground on wheels though, and don't have much ceiling height to raise them either. . I really don't wanna rip up my new floors to install electric or liquid coils either. I can't add skirting or do anything permanent looking to keep the air from blowing under the trailer, and never know when it might need to be moved. Plus, i store a bunch of materials underneath it, which constantly need to get at. Maybe I'll just get a spray foam kit, and do the entire underbelly a few more inches. Or add more 1" rigid foam, with yet another protective barrier sheet ofmetal like is already down there. Suppose i could just buy a few of the larger heating mats made for ice melting, and lay them down when needed. Nothing beats radiant floor heating!
Any other plants I had on regular heating mats over the winter didnt get PM , just the one near the cold un-insulated enough floor. Come to think of it, I didn't run my aquarium heater like I normally do either. The water was pretty cold , even sitting next to an oil heater...