Highbeam, I just installed a Fujitsu 18,000 with a 9,000 and a 7,000 inverters. I'm a general contractor so I have all tools and experience for most of the install. I ran the line sets, drain lines and the wiring between outside and inside units. Had my electrician tie into the panel. Had HVAC contractor do the line set connections and start up. Pretty easy to do even the electric and HVAC is easy. I didn't have the tool to vacuum out the line sets. The heating is great and seems pretty economical so far. I put the interior units on inside walls down to the basement to outside. It's very quiet and not so bad looking. I found a site that was helpful. I will pass it on..