Yeti, I think that you would get more attention and participation if you create a new post.
BTW, my 18K BTU minisplit is pretty inexpensive to operate -- between $1 to $2 per day (@$0.11/KWH) when I run it. That 24k unit is way oversized for a 16x22' space. Even in my 20x20 garage with limited insulation (none on the exterior walls) 18k has handled the 100°+ temperatures this year with no problem. You might be better off buying a new 12k unit, which should be sufficient for your space. Depending upon your local climate, a 9K unit might be enough.
Pioneer minisplit units are less than $1000, come pre-charged so you can install them yourself, and you only need to evacuate and test the connections on the lines, which you can also do yourself if you have or buy a pump and manifold.
--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.