[alfie43]

The all-around best units for a garage are the ceiling hung "Modine" type heaters.

However, if cost is a factor, and when is it not, a Home Depot type un-vented wall heater is cheap and will heat your garage beyond your expectations.

Here is a picture of my 15,000/30,000 btu wall heater. The best $250 I ever spent. I have a 3-1/2 car insulated garage with insulated doors. I live in S/E Michigan and I turn the heater on in December and leave it on for 4 months...until around mid-March. The only problem I ever had with this heater was the garage had a tendency to get too warm. I solved that by running it in the 15K mode, but I still had to throttle it down with a ball valve (see photo). I never run it in the 30K btu mode.

Normally, I try to keep the garage temp around 55*-60* all winter. If I have to work in the garage, I'll turn it up a little. It can easily and quickly warm the garage to the upper 70s (or higher) in the dead of winter.

My wife calculated that it cost less than $1 a day to heat my garage at the 60* setting....worth every nickel. Sometimes, I will jump in my car (not the Camaro) and drive off in my tee shirt...in February!

Alfie