As a renter of a home with a ground loop buried heat pump in Wisconsin I was very disappointed in winter. It was cold inside and there was no way to keep it warm. I wouldn't rent another house with a heat pump.
Aha. Yes I just have the above ground type. The only person I’ve met with an in-ground type wasn’t satisfied with his either but I figured that was because he was retrofitting it into an older home.
Your unit was undersized for the load. It's no different than having a too-small furnace.
Just my point. Many builders over-estimate the efficiency of a heat pump when deploying the systems in places where it's -15F for months at a time and the frost line is 60 inches down. The label rating isn't going to be achieved. That can be fixed in time with better heat pumps made for actually cold places but right now there are still early adopter problems that don't apply to traditional furnances/heating.