Home HVAC cost?

I installed a 3 1/2 tone heat pump package unit with aux heat strip, last fall in my rental. Problem in Florida, is if your not a contractor it is a ***** to get a unit or any parts locally. I bought my unit from Lowes On Line. The local store would not sell to me, but on line was fine and they delivered. Cost was $2900.
Took the old unit, repaired the leak, Redid some previous "butchers" wiring screwups, did a refrigerant retrofit and installed it in my garage. Biggest expense was the jug of refrigerant.
PS: I am certified in both section 608 and 609 but I am not a "contractor".