they make units that are wall hung, ceiling cassette, and ductless units. All the head units need a line set (1/4 copper,3/8copper and 4to 6 wire cord) also need a drain line run from inside unit. You can put more than one indoor unit on a outdoor compressor if you buy a multi room setup. But the OP said he needed one for his garage. Just get a simple wall hanging unit run the lines yourself and you will wonder why it took you so long to buy one. under 900 bucks shipped to your door off ebay.