I've got a small shop, and it's fairly well shaded. My air is open the window in the back and turn the fan in front of it on - blows air thru the shop and out the door. Make is comfortable enough, even on the hot days; I'll stick with this.
Heat in the winter is the real issue. I'm not fantastically thrilled with the setup I presently have, it takes about 15 minutes or so to get it fairly comfortable, but it's faster, and better, than the system I had before. Bottom line is, it does work, and I don't have to sink money into something else.
Get what you can afford. Then try to properly appreciate it.
"It ain't what you're told, it's what you know." - Granny Weatherwax
Fawkahwe tribal police SWAT Team
Some days, the supply of available curse words is insufficient to meet my demands.
.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.