I have installed some heat pumps. No geo thermal systems yet or even being marginally involved with them. I will try to pass some things along. Even up here in eastern Canada that has become the heat pump capital of Canada.

People still buy on price here all too often. The inefficient units will always be made as they can function well enough in moderate climates. My guess is the distributors may not even handle the really high efficientcy units in moderate areas. They do cost more.

The problem with geo thermal in my opinion. Is usually the people selling them are giving the advise. There are many situations where they really should not be installed. As the soil is not good enough at thermal transfer.

I also do not think they are good for people getting up in age as the payback is too long. .You can do it with drilled wells. Not the best ideal if you have to go deep in some regions. I have a simple theory. Planned well they in general work well.

Where we reside the area conditions usually are so good. I am trying to buy an excavator. So a brother in law can do the digging and field installations.

I figured a large auction was semi rigged for one I was interested in this week. As the price realized was what I suspected it would be. The same price the last twenty units of the same model put through their auctions realised within a thousand dollars. Almost no matter what their condition was. I had mentally formed a reasonable value for it.

So I am forced to look further. I have found a 2018 cat 304 model with thirty nine hours on the hour gauge in Michigan. I will have to find the low bed trucking charge to get it up here before I try to bid it. I may also look at rail charges.

My point is the person with some experience with geo thermal. Should not be involved with selling them to you. Instead someone else estimating the practicality in your location. The first one we will be installing is in the ground water near an overflow well. The water in the ground table around it moves continually. So the heat transfer is optimum. What I am doing today and have been for sometime. Is for the benefit of our children and grandchildren.