I put in my own geo about 9 years ago. I went with a split geo with a natural gas furnace as backup/auxiliary heat. If I had to do it over again, I would do it exactly the same.
Mine is 38000 btu (3 ton) 2 stage waterfurnace that I bought on ebay. It had been damaged in shipping, so I got it cheap enough.
I used a QT zero pressure flow center so I didn't need a flush cart. I have 3 slinky loops, 1000' long each.
I have some pictures on youtube if you would like to look at it.
Search for "geothermal heatpump install" under djastram.
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