My parents out in Saskatchewan went with geothermal years ago when they built a new house. I beleive it was about 15 years ago. It has long paid for itself, especially in a setting where you have to have the gas delivered. It's worked very well for them over the years and they have only had to fire the electric backup element once when it was like -40 or something stupid cold.
It's really nice not being dependant on gas prices. I think the initial cost is well warrented, additional costs are minimal electric for running pumps etc.
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