[k92]

I use a hotdawg forced air natural gas heater in my insulated 24x30 shop w/o any problems. I believe that it's 45,000 btu.I keep the shop at 60 degrees when I am not out there and can get it to 75 in about 15 to 20 minutes if I want.I used r-19 in the ceiling and r-13 in the walls and sheetrocked over it all so it's really pretty tight. Heater comes in many different sizes,mounts on the ceiling and cost me avout 450.00 with shipping.