I just put in a Sterling GG 60k btu heater in the garage after waiting a few years (also have used electric and torpedo in past garages). Works great and can keep a 3 car any temp I want (ie 70 when its -10 outside). If you get the dual combustion chamber its very quiet (the air running through it generates most of the noise if its not a separate feed). That also allows you to work with any chemicals/flammables without worry, and no weird smells or anything. Also tucks up to the ceiling nice. I put mine on a Wifi thermostat so I can turn it up before I go out there and monitor the temp remotely (although I've noticed it only runs for about 1/2 hr a day if I leave it at 55F when its 10-20f outside. Honeywell makes a decent simple model for $90. This is the site most recommend when purchasing (and gives you an idea on pricing for different sizes). https://www.littlegreenhouse.com/accessory/heaters4.shtml
Its important you insulate any space your working in if your going to be heating it with any regularity. You also want to get the right size. Most people seem to oversize it but in the long run your better off with the right size for your uses.
Radiant heating is good if you have at least a 10 foot ceiling and always work in the same spot in the garage. Its also great in commercial spaces with even higher ceilings.
Its important you insulate any space your working in if your going to be heating it with any regularity. You also want to get the right size. Most people seem to oversize it but in the long run your better off with the right size for your uses.
Radiant heating is good if you have at least a 10 foot ceiling and always work in the same spot in the garage. Its also great in commercial spaces with even higher ceilings.