Help is at hand though courtesy of [petey53], who made his own ground source heat pump for his Toronto house using a pair of window-mounted air conditioning units. A custom copper “trombone ...
“CO 2 has a far lower GWP and ozone depletion impact than commonly used synthetic refrigerants and, used in its transcritical cycle, can maintain heat pump performance at lower source ...
Your refrigerator uses the same principle. The problem is that air source heat pumps-- those that exchange heat with the air outside -- get less efficient as the temperature outside gets further ...
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