I'm actually thinking of installing a Mr. Cool mini split myself. The kick with those specifically is that you don't have to do the refrigerant part, which is the hardest bit as they come pre-charged. You only really need to do the electrical part, and if you have a 30amp socket then you are really in DIY land, otherwise it's a fairly simple job for an electrician to bang out. Maybe there are more brands that come pre-charged, the Mr.cool was just the one I was looking at because you can order them from Home depot which makes thing easier.