We bought this heater for our r.v.in Az.at least 15 yrs.ago. Absolutely the best investment we've made for our rig. Snowed in in the high desert,iced in in a mountain rest area, and camp the Oregon coast regularly all winter when home,and always comfortable. I put a simple 4" 12 volt electronics cooling fan 3" above it that brings fresh air in through a slightly opened window and circulates the rising heat throughout the rig. Wife calls it the heater from heaven when we get below freezing weather.