The New Air G73 may be small in stature but it performance is LARGE ! I have a 23x23' attached garage that is insulated. It takes a very short amount of time to heat it up comfortably to be able wear a tee shirt. This is with the polar vortex cold weather we have been having with single digit temperatures ! I keep it on a low setting, and it comes on twice an hour for a few minutes each time... to keep the garage in the low 40's when it's not being used. It's a great unit with lots of great features ! I highly recommend the G73 and I also highly recommend Air & Water! The ordering and delivery could not have been easier or faster !