No way to move the room over to the a/c window?
Have you thought about putting an a/c in the wall of the room? The heat would add to the garage heat, but the grow room would be controlled.
Are you saying cool ac in grow room ,not the lung room where I get air ?A/C is usually used with closed rooms, because unless you have massive A/C you're simply exhausting all your cold air out the exit.
700.00 from Blue ridge for a unit 12,000 BTU...that'll do ItIdk, mini splits are pretty cheap nowadays…
How many watts do you plan on running <- that will dictate the size AC you’ll need regardless.