I am looking a building a geothermal system from scratch and hopefully very cheap. I am fairly experienced with automotive ac. I built a large unit for a meat cooler with recycled auto parts. I farm and don't have a lot of money to throw around and do love learning and tinkering.
Right now I have a 10 year old 32000 btu window ac unit that was used very little. It is charged with r22 and has never been opened. It is still works very well. I was thinking of pulling the compressor (it will be sucked down first) and building a geothermal system. I use large amounts of water feeding livestock. I am looking at purchasing a couple of brazed plate heat exchangers and tapping into this water supply as it leaves the well before it is dumped to the livestock. The entire geothermal pump will be water to refrigerant and I will not need a reversing valve. I will simply draw hot or cold water off the appropriate side as needed for heating or cooling and circulate it through my unused floor heat and hydronic rad in my furnace. It will also supply my hot water. I know i will need to purchase a txv, heat exchangers, and filters. I normally work with automotive stuff and use redtek12a but I have a friend with r22 that can charge the system for me.
What do you think of my project and what do you think I should purchase? Thanks.