You can find more information about geothermal energy, its applications and related facts in the following websites:

NIBE Manufacturer of geothermal heat pumps

Otras Energías Spanish finder of alternative energies

EHPA European Heat Pump Association

U.S. EPA ENERGY STAR Program Program of efficiency of energy of the government of the U.S.A.

U.S. Department of Energy Office of Geothermal Technologies

IEA - International Energy Agency Heat Pump Centre Energy department of the government of the U.S.A.

IGA International Geothermal Association

UNEP United Nations Environment Programme

Geòtics Innova SL

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