[Piotrsko]

All the heat pumps I inspected, set up for self installation come over pressured with the appropriate (natural gas derivative in mine) refrigerant for +/- 20ft additional in {some are 30} and out lines so if youre careful and buy the expensive recommended puncture connections, you don't need additional refrigerant. I was 15 ft, and the installers did not add refrigerant that I saw during the install. Ducting was a different story.

Efficiency went up a bunch wrapping all the 75 year old ducting with foil backed wall insulation after final inspection

It's 24f outside this morning. system ran for 45 minutes to get house to 72 indicated on the thermostat (69 in the furthest room next to unheated garage) from 65 degree holdover

Every system I looked at had provisions for 3-5 kw supplementary electrical heat coils in the under house unit but required a second 25 amp circuit in the panel to run them. If I ever get to -14f I have a pellet stove backup

Was a buyer for 20 years or so. I kinda know how to buy stuff