I've been wanting to put one of those in my garage for a whileIf you are at all comfortable with stuff on your own, installing minisplits is super duper easy. You just need a vacuum pump and an R410 gauge kit.
you can get 110v units.
outside
inside
All you do is run the copper lines between them, just have to do a flare, just like with plumbing. Pull a vacuum, verify vacuum, release the charge and turn the unit on. The 9000 BTU one in my office was like $700.