Posted by Wayne_H on January 12, 2008 at 15:43:42 from (68.50.114.219):
In Reply to: geo-thermal heating posted by TVB on January 12, 2008 at 07:34:13:
We have a 5 ton geothermal unit using 5 closed loop wells. (one per ton). Facts are facts, and when it gets real cold outside standard heat pumps do not work. (like below 20) Geothermal does not know the outside air temperature, so they work well regardless of the outside air temp. With that said, we have two units, a 3.5T and 1.8T. Both are Waterfurnace now. The 3.5T has had some problems (needed a new coaxial assembly and a new coil= 3k) and we replaced the upstairs unit entirely this year. I sort of hoped they would be more trouble free, but they were for the first 12 years, so I guess I can't complain too much.
Cooling in the summer is awesome. They rarely go on stage 2. Heating in the winter works them harder. (outside air is 20, room air is 70, so a delta of 50 degrees). But, ours works well with no resistive or aux heat to about 20 degrees. In Maryland it seldom gets below 20 anyway.
Our cooling bills are way less than our neighbors. Heating is less also, but not as great as saving as the cooling.
Would we do it again? Yes. Another big advantage is there is no outside units to look bad, collect leaves, and take up space.
As somebody said, get somebody to do your wells who knows what is going on. I'd suggest against open loop, unless you have a lake or pond near your house.
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