I realize there's lots of details to consider, but I am hoping someone can "get me in the balkpark" regarding my thinking.

Assuming one has a known tonnage requirement and was considering an air to air vs a vertical closed loop geothermal heat pump....I realize the geo will be more expensive to install in virtually all cases.

My question is, when comparing a high efficiency air to air vs the geo, is the primary cost difference the ground loop???

I realize the geo has no outdoor unit so some hardware costs are saved, and I know the ground loop is expensive, just not sure if/where the cost differences lie when comparing a high efficiency air to air vs a geo???

Thanks in advance for any ballpark responses.