Lately, I've been talking to a new vegetarian acquaintance -- a physicist with a keen interest in renewable energy -- about geothermal heat pumps, or ground-source heat pumps, to be even more specific (i.e. to distinguish them from air-source heat pumps). I'd mentioned to him my recent visit to an off-grid solar-powered house in the Knowlesville area of NB and he brought up some figures on the cost effectiveness of different types of renewable (and non-renewable) energy in Eastern Canada. Apparently, solar doesn't hold a lotta water for him, mostly because of installation costs and also because of the relatively low amount of sun we get in this colder climate. I did some investigating and am now really intrigued by this type of heating system. Various articles about these ground-source heat pump systems (e.g. this one), claim that by using them, you can lower your heating / cooling costs anywhere from 30-70%. Also, although the initial installation costs are several times higher than installing conventional heating systems, those costs can be recouped within 5-10 years.
Essentially, what happens is that when you dig far enough down into the ground, say, 3 or more metres, you reach a point where the temperature of the earth is constant year-round, varying according to latitude. So the ground source heat pump, using a small amount of electricity and a compressor, extracts heat from the ground to heat your home in the winter, and then in the summer it extracts heat from your home and pumps it back into the ground.
Mother Earth News has a much more detailed (and average-joe-reader-friendly) article on these pumps here. I hope to share more about this type of system as I learn more, myself.
Essentially, what happens is that when you dig far enough down into the ground, say, 3 or more metres, you reach a point where the temperature of the earth is constant year-round, varying according to latitude. So the ground source heat pump, using a small amount of electricity and a compressor, extracts heat from the ground to heat your home in the winter, and then in the summer it extracts heat from your home and pumps it back into the ground.
Mother Earth News has a much more detailed (and average-joe-reader-friendly) article on these pumps here. I hope to share more about this type of system as I learn more, myself.
