Equipmentland offers this Job Sizing – Heat Requirements Chart for your convenience. We are not HVAC (heating, ventilation and air conditioning) professionals and do not make recommendations. We are happy to advise you of what others of similar applications purchase to fit their needs. We have a lot of experience selling heaters, but when purchasing heating equipment, it is your responsibility to identify heating equipment to meet the needs you establish. There are many variables that effect heating time, heat loss, air exchange etc. For temporary heat, our customers usually purchase heating equipment that will be more than they need, and modulate or turn on/off  according to desired temperature, so that they are not underserved. Equipmentland offers heaters of diverse types such as electric, oil (diesel, kerosene, Jet A) and gas (natural gas or propane).  Also find this chart here.