Garage Heat?

I have a 24' X 40' three car garage with a raised ceiling in one bay for my lift. I have been using 2 ceiling hung electric heaters that I got from Home Depot. I have been using them for about 10 years now and they do a great job. If I can remember, I think they cost around $225.00 ea. plus my electrician running the plug-in receptacles for them.