Cost versus return
Jack Stephenson makes more good points. It's all about cost versus return.
To Gilford voters, Selectmen, and Police Facility Committee (FPC), 1-21-09.
I’ve been searching for information to justify using geothermal energy here in Gilford with the coldest ground in the USA. Can’t find any. The best data I can find says that if the ground water is at 45 deg F then the heat you get is only the heat of electrical energy you put into the pumps, and the ground water in Gilford is 40 deg F or less. It is thus easy to understand that our Selectmen rejected geothermal heat for the Town Hall when shown that just the interest on the investment to install it was double the cost of current oil heat.
How then is it possible that the FPC decided to use geothermal heating, when their big goal was to reduce costs? They have not shown us any data to justify that outrageously high cost. The new library has geothermal heating, and the only information we’ve gotten so far is that it is difficult to regulate. Absolutely nothing about cost versus return.
The Town hall uses hot water heating to radiators, the healthiest heating system, since it avoids blowing pollutants, dust, pollen, mold spores, etc thru the facility. The FPC shows using expensive heat exchangers, blowers, and steel ducting to distribute the heat. Where is the economic justification? Just "business as usual, damn the cost, full speed ahead"?
More amazing is the use of just one well, and return cold water going back side by side with the pipe for ground water (thus chilling it), and then back into same well. Seems like sci-fi magic. For less than 2% of the cost for geothermal installation they could insulate enough so they could heat for 5% of the geothermal operating cost!