I have installed 2 Fujitsu Split units in rentals. As @Ronan M indicated they are common for years in other parts of world (I see many in Europe where the heating is often primary radiators (no ducting) with Splits providing supplemental heat and AC. I therefore believe the technology to be established and the units to reliable.
The two I had installed were 4 or 5 years ago and they work great and were reasonable cost. One was for a 4/2 (1500') and the other for a 3/1 800' (it is really 2/1 with bonus room that tenants use as a bedroom). Both of the tenants love them.
However, I recently got a quote for 2 different rental units from the same vendor as did the other install and the price was significantly higher than previously (over twice as much money). I question if my HVAC person simply has more work now and can charge a premium. The 2 new units are to be put in 2/1 of almost 700'. The quote was over $6K each (my 4/2 unit was less than $3k 4 or 5 years ago).
In summary I think they are a good solution especially where ducting would be difficult. However, I am not going to pay $6K to get it installed per my most recent quote. I may seek other quotes or look into the feasibility that my handy man could do the install (he is only an OK handyman, I used to have a great handyman (that I would trust for this installation) but his Mom had a stroke so he does very little work for me recently).
