http://www.naturallynews.org/science/how-heat-pumps-work/ Posted on September 1, 2010 by Steve BrownSteve Brown Development Director for Envirotec Ltd explains the theory behind how heat pumps work:  Heat pumps use the same technology as is used in a refrigerator, exploiting the temperature difference between the refrigerant gas and its surroundings. Both rely on three key facts.  Heat will move down a ‘temperature gradi... Thu, 02 Sep 2010 00:59:03 UTC en