Posted by toolz on January 13, 2008 at 16:53:35 from (66.158.169.70):
In Reply to: geo-thermal heating posted by TVB on January 12, 2008 at 07:34:13:
I built my house (2500 sq ft) 11 years ago, installing a geo-thermal unit at that time. We chose a Bard unit with a Bard propane furnace for back-up, closed loop, with 750 feet of pipe field. Vertical loops were not common then. We avoided Waterfurnace because an electric back-up is too costly to run. My buddy, who owns an HVAC company, said the Bard compressor was nearly indestructable, and would pump mud if it had to. The only problem we had was in the first summer, when we had a freeze-up in the compressor unit, which stopped the water flow through the loop. The loop contractor had not put enough methanol in the mix. Since the two loop pumps are water cooled, they overheated, made a bunch of pressure in the loop, heated the piping near the pumps, and blew out the plastic pipes. Methanol/water mixture blew all over the utility room. The contractor fixed everything, and covered all the damage. It has been trouble free since, and has saved a ton of money on propane. My house is well insulated, and the system will keep us warm down to sub-zero temps. If it is very cold with high winds, the propane will kick on, but not often. Cooling is excellent. I would recommend this system to anyone, and will install the same setup if I build again.
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