[anonymousab]

One thing I am learning in doing research for local installers and HVAC companies is that you can't really trust any installer to do it right. Even the highest reviewed company will have tons of monthly reviews about wrongly installed equipment or bad advice to customers.

Like buying any major appliance, unless you shell out a commercial fee for a commercial product and contract, you're just gonna be rolling the dice. You can do it yourself but the heat pump unit itself may still vary dramatically from sales specs.