I was expecting a larger unit when it came in the mail. Although this was misleading. I have a 480 Sq. ft. garage that is not insulated with 10 ft. high walls. On a 20 degree day, I turned the unit on and left for approx. 35 minutes. The garage had warmed to almost 50 degrees. Within an hour the workspace was comfortable without gloves. The unit is a little loud, but didn't really notice in the shop. I just turned up the radio a bit. Very happy with the overall performance of this unit.