..I wanted to try out the heater so I cardboared and taped a window in the house and cut around the intake for the heater..just as I got it set up and went inside it clouded over for the day..how much is the temperature supposed to go up in a house aft 21 seconds..blurg. I know of something else to fix on the new heater too..the intake should go from the back into the house via the intake and not from the top..also much bigger!