How can I improve my crawlspace's heating efficiency in the winter?
When I lived in Ohio I had my water heater and a pressure tank in a room under my front porch, their was a full basement. Trying to save some $ used foam board insulation around the two and used a small milk house heater on low set to ~ 40 degrees. then I had pipes in the floor freeze, I used heat tape it was a self regulating kind for use under a floor of a house I think it was made by 3m but that was many years back, after putting in the “foam room” and 2 strips of the heat tape our power bill dropped by 50$ a month and we never had another frozen pipe. My neighbor had a similar setup but used a heat lamp 300w but he did not know when it burned out and still had frozen pipes. I think the small heater was better because it had a thermostat, he said the heat lamp was better because it only drew 300w my heater was 1k or so on low and I use a similar heater today in my pump house they last a really long time if not turned All the way up and moved around. so that would be my suggestion a small insulated space and heater , then self regulating heat tape , make sure it is made for use under the floor, the last batch I purchased was by easy heat called freeze free, you have to buy ends separately but you cut it to length and it is listed for use under mobile homes and they are the fastest burning structures I know of, I only started using it 2 months ago but the end kits are way easier than the 3m type I have used in the past. (No connection to either product just make sure to find one for inside use)