Sure fire way to asphyxiate yourself. Keep propane outside. Do you know what they call someone who brings anything other than a 1 lbs propane bottle indoors? Crispy idiot. Don't do it. Something happens, I don't care if you have $100,000,000.00 liability insurance. They will not pay a penny because you were totally reckless. Home made propane powered device? Not UL listed. Only a total idiot would play with that. I know you don't want to get stopped by DOT. Drive a commercial vehicle and the DOT sees that as a target on your back. I know a cleaner who took a $5,000 bath for pulling the ground out of one of his electrical cords. Another stupid thing you DON'T do. Right up there with no MSDS book within reach.I had that mytee heater and it was just ok, couldn't really keep up with a 2 jet wand. Now if I were you, I would make some kind of mini propane powered heater. something small you could bring inside and it would work off those mini Coleman tanks.