These need some sort of fresh air or a window open before I can use one, I must be one out of 100 that will fall dead on the floor and have a head pounding head ace from being in a shop that is sealed to tight, I am going heat pump system because here in my area we don't get long cold winters, just those 40 degree days threw the last of fall and early spring day last for a couple months, then it's all about the hot days , A/C is our 8 moths of weather problems for working in a shop..
