Ok, thats what I was looking for. My booth draws air directly from outside so in the winter its too cold to paint using that method. In the winter, I minimize my painting projects, but do have the option to draw air from the heated shop rather than outside. Shop has two options for heat, wood stove and electric. If I try and draw air from the shop with the wood stove going, it sucks the stove pipe right out of the chimney and all the ash from the fire and chimney with it. Electric works for the actual spray time. Once I get the booth, metal, and paint temps up to spray, I can spray with not a lot of drop in temp. Then after the booth has done an air exchange, I can get the tempreture in the booth back up to specs with very little time below spec. In the winter, its just a matter of using a different air supply (heated) to get the air into my booth.