His suggestion was to look into abandoning geo and going with one of the newer high-efficiency furnaces to cut the replacement costs and lower the excess cost of pumping water. He also said the pump (circa 2005) is running most of the time the furnace is running just to keep up with demand. He said they need to be large (read: "more expensive") because of the large volume of water needed for the geo system. Separately, our well guy told us the 23 year-old pressure tanks are at end-of-life and need replacing. The HVAC company prefers Tranes but also handles Water Furnace systems. They said the likely problem was scale on the internal piping but couldn't rule out other issues. I called the HVAC company for service and they said we're only getting 27,500 BTUs out of a system that should be putting out 55,000. My November PPL bill was $245 with just weekend use. Now, with 18 degree days, the system can't keep up and we're using aux heat just to maintain temp. At inspection, we were told the system would need replacing. It also appears to be connected to the 2 short water heaters in the crawl space. Last spring, we purchased a 2,600 sq ft vacation home in the Poconos that came with a 23 year-old horizontal Command/Aire open loop geo system supplied by our well and dumped back out into another well.
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