loft made out of thick Polyurethane insulation sheets. Now have two space heaters. That juxtaposition sounds scary from a potential fire point of view.
I would used only non-exposed element sort of heaters in that situations, like oil-filled convective heaters.
Glad I spent money ten years ago insulating and re-glazing my old mobile home up in here in Washington State. A small ventless propane heater (~20,000 BTU) will keep it at 65 even when it is 0F outside. Furnace doesn't even have to come on except to warm it up to 70 in the morning.
Thanks for the advice. Aware of the fire hazards. Use one small ceramic space heater in the igloo. On a wide pedestal with nothing near it. Turns off if it falls over. Aimed toward my feet on the bed, not the insulation. Igloo area is over 10 feet long and about 8 feet wide. Did not need the heater last night. Don't like to breath cold air while sleeping. So extra blankets wont help. The shop has an indoor very old gas heater that is just not efficient enough. Gas bills were way too high.