One point that has not been made with mini splits is that they can HEAT efficiently down to well below zero. I installed a Senville last year myself, and the only hard part was drilling a 3 inch hole through my cast concrete basement wall. Once that was done, I cast a 3x4ft pad (didn't want to buy a pad that would have to have been leveled anyway due to slope) then installed the base bolting it down. I left the lines full length and they ended up perfect for my install. I didn't purge with nitrogen, but did buy a vacuum pump and pumped out the lines and inside unit (gas is inside the exterior unit full charge with set line length). Opened up the lines and then checked pressure with my gauges. Was perfectly at right pressure. Unit was really purchased to heat basement as basement was not built with intention of really heating with the main HVAC, only a couple of drops unfortunately. But it works well. EASY install, tools were a few $ off amazon.
Woodworking, Old Tools and Shooting
Ray Fine RF-1390 Laser Ray Fine 20watt Fiber Laser
SFX 50 Watt Fiber Laser
PM2000, Delta BS, Delta sander, Powermatic 50 jointer,
Powermatic 100-12 planer, Rockwell 15-126 radial drill press
Rockwell 46-450 lathe, and 2 Walker Turner RA1100 radial saws
Jet JWS18, bandsaw Carbide Create CNC, RIA 22TCM 1911s and others