I had a Mitsubishi installed. It works very well except for humidity. The coils are just not cold enough. Tech says they are fine and running @ 65 is normal for a light load. I had to buy a dehumidifier. I think there is something wrong with the expansion valve or control there-of, but tech does not know and the OEM does not return calls. Split pulls out maybe a pint a day and the dehumidifier about 3 gallons. Where that much is coming from is a mystery. 16 x 32 pretty well sealed up. Even with the 90% we have had recently, blowing my mind. I want the shop between 50 and 55%. It had gone over 80 with just the split running.
Depending on your county, there are codes for how it is installed and technically, you need a permit and inspection. Usually an outside dis-connect.
Do NOT mount the outside unit on brackets on the side. They have a low frequency rumble that will drive you crazy. Set it on a platform off the ground unless you have serious isolation mounts. Inside unit goes high on the wall.
Most splits are pre-charged, so if you get the lines on quickly, they wil be fine. The charge is by weight, so you can't test by temp delta like the old days. Fun with variable speed compressors. If it does need to be serviced, only pros can get R410.
Even with my dust collector and air circulator with MERV 13 filters, my evaporator loaded up. So I build a large box around it with MERV 13 filters on it. Coils stay clean.