Geothermal is good but the start up costs and other expenses should be looked into. Also is NH a good place for geothermal compared to other alternatives? You have to drill a deep well and then strip the heat from the water in the well. Not hot water either.
I looked into it a while back and if I remember you may have to supliment (sp) geothermal with a fosil fuel, oil, gas or even electric, occasionally during very cold spells. It can also be a complicated system too.
An alternative my brother had installed in Maine near Bar Harbor was a ceramic electric system that feeds the radiant (water) in floor heat in his new home there. It has 2 large ceramic plates that heat up to 1500 deg F during off peak hours and that lasts all day even on the coldest days. He had an engineering study done and it determined that the ceramic system was cheaper than oil, gas, electric or other methods. The system is a little larger than a normal furnace but is extremely efficient. I have stayed there a few times and it was very comfortable. Never had to touch the thermostat once.
The house is all high tech and overall cheap to operate.
PM me if you want more info. I am sold on the virtues of the heating system for NE. This is the link to the house my brother built.
http://www.knightarchitect.com/curre...berry%20field/