No A/C in the garage.  Garage is in the shade until later in the day, use a couple a fans, or I find something else to do when temps rise too high. 

24,000 BTU Daiken mini split.  Blows ice cold air on 100 degree days.  Very sensitive to filters being kept clean… I try to turn it off when painting, grinding or welding.

Don’t mount any AC unit where it blows against the side of your car when on the lift. It causes it to pull cold air into the return air snd can cause freexe-up.  I made that mistake in my old shop in Ovilla, but there wasn’t much choice of where to mount it.

TKOPerformance wrote:

When we built a new church 5 years ago we cleaned out the old one and I noticed there were two giant through-the-wall AC units in the sanctuary.  I said to the head of the property committee "what are we doing with those?"  His response was "Nothing.  We don't need them in the new building and they're too hard to get down".  I asked if I could have them and he said if I could get them down they were mine.  The next day I postponed what I had to do and took my crew to the church, pulled the units, drove them back to my shop, built some openings in the side of the building, and have had AC ever since.  Its definitely a game changer.  My shop is a bit smaller than the church, so they cool it down super fast, but the biggest benefit is pulling all the humidity out of the air.  That's what can make the DE summers brutal. 

     Nothing like free shop air, well almost free. My understanding is in high humidity areas it's better to under size a little so the AC runs a little longer and removes more humidity. I guess as they say beggars can't be choosy. 
     Not so worried about shop AC but the house AC (heat pump) has been out over 2 weeks. Tried to repair once but didn't hold, 17 years old, decided to replace. AC guy ordered unit and he was suppose to be hear this week. Still no show, hard to complain the way things have been lately. A few years ago we put in new sky lights and a new sliding door with blinds. Helps blocks the sun and keeps the temp down. I'm good the way it is but Brenda likes to have it snowing in hear, if he don't show up soon I think Brenda is going to go postal.
 

Heat pumps in particular are most efficient while running, so you don't want to oversize them.  When in doubt ere on the side of a little smaller.  If you have a thermostat you can get one that has a temperature as well as a humidity control.  This allows you to run the AC just to remove humidity without a dedicated dehumidifier.  I've done that in my house, works well.

My shop its just full blast, on or off.  I think that between the cold air falling and the heat/humidity rising and a 14'+ ceiling it pretty much kicks butt.  It'll go from 90+ in there to 75 in about 20 minutes.  Heat's the same way, but that's what 250,000 BTUs will do...