Only about one-third to one-fourth of the energy delivered in heating with a geothermal system comes from electricity consumption — the rest is extracted from the ground. Given that geothermal heat pumps are more efficient than furnaces, why do they consume more electricity (and how that will affect your monthly bill)?
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Geothermal heat pumps don’t generate heat — they just transfer it from the ground into your home. For every 1 unit of energy used to power your geothermal system, on average 4 units of heat energy are supplied
According to the US Environmental Protection Agency, “geothermal heat pumps are the most energy-efficient, environmentally clean, and cost-effective systems for heating and cooling.” They’re predictably low-maintenance, don’t burn expensive fossil fuels, and can reduce energy bills by 65% or even more
Disadvantages of geothermal energy
Environmental issues. There is an abundance of greenhouse gases below the surface of the earth.
Surface instability (earthquakes) Construction of geothermal power plants can affect the stability of land.
Expensive.
Location specific.
Sustainability issues