Portable air conditioner for the garage?

Keep in mind that as it blows air out, it's going to suck air in, which presumably will be through the other vent (ambient temp air from outside.)

I use one at home and it works decent. It's a "heat pump" style so it heats and cools.

I used one. I adapted a plastic storage box and screwed it over the lower side vent in the garage. I cut a hole in the storage container the AC exhasust snaped into it. There is a hose outlet for water condensation on the back of the AC unit. I ran the hose into a container ( I used a old milk carton) I closed the ramp door on the extention cord and pluged it in the 20amp the trailer was pluged into the 30amp. Portable AC was a 9k btu and it worked fine. When I got my new trailer I added a second roof ac to the garage...So, don't use the portable anymore..

My rig has two vents that never get used. I figured I could adapt one of those for exhaust.

Remember they must be vented to the outside.

is there some way to vent it out of the garage area?
bumpy

No reason it wouldn't.....as long as ramp is closed