Shop/garage heating & cooling: what'd you go with?

[P.J.]

I pondered all those options too.Then a friend of mine said
why spend all that money on a heating system for my 20 x30 insulated shop.Just go to HOME Depo and buy a 220 volt
electric thermostat fanned heater for $ 75.00 and that all you need.
I Did just that and its perfect I can control the temp
as hot as I want. When I go to work in the shop I turn it on and in about 10 minutes its at 72and hotter if I want.
I also leave the heater on at about 55 when i am not working in the shop. The electric bill is just slightly more than when I am not running it. My friend put in a gas
overhead furnace at a cost of 1500. dollars. It will take a long time for me to spend 1500. on electric bill to heat my shop
PJ