I heat my whole house with a single air sourced heat pump and so far it’s been very good. There is definitely some efficiency that is lost when it drops well below zero but overall it’s been great and the upside is ac in the sweaty parts if the summer. We also have solar so that helps offset the costs.

A newer house up the road is using both geothermal and air sourced heat pumps. Might be a bit overkill but if it’s new construction and the contractor has the excavator there the costs of install seem pretty modest plus I was told that the loop only needs to be 6ish feet down.

If I had to do it again I think I’d still use air sourced with solar. Good incentives for both and solar is a good hedge for rising energy costs.