You will find walls and floor and ceiling are very poorly insulated and will be cold. But a darn sight warmer than any tent. And the mattress beats the ground at night. Straw bales work for skirting but are a fire hazard. House trailer skirting works well. And you certainly will need a dehumidifier to keep the condensation off walls and ceiling. Just your breath will cause that. Use the furnace, it is safely vented outside. Avoid like the plague unvented propane or other fueled heaters lest you asphixiate yourself. Some folks here will recommend them, but they are dangerous.
