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gwbas1c
on Aug 20, 2019
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A World Without Power (2013)
Air.
Ground heat pumps are very uncommon; "heat pump" is assumed to be air based.
Gravityloss
on Aug 20, 2019
[–]
Ground heat pumps are common here where there is large temperature variation. They are a more expensive investment but much more efficient.
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Ground heat pumps are very uncommon; "heat pump" is assumed to be air based.