This is the pimpest tent around. I have a INDOOR rated (o2 sensor'd) 35,000btu propane heater, that gets pretty good milage for longterm heat. And a 60,000BTU propane blower heater for anytime resin is out. I can get the tent over 105F in under 5mins. I also have a carbon monoxide detector in there just to be safe, but the tent is vented 1.5" around the bottom so it gets good airflow. Best part about it is that I dont have to worry about making a huge mess in a garage. Lay a cheap carpet down and spray/spill, dust, dirt, whatever. Shop vac the carpet and toss it at the end of the season. Thats very convienient for work with gelcoat and stinky resins.