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[–] 6 points 11 hours ago (4 children)

As long as it above 0K outside, you can (in theory) transfer energy. Heatpumps meant for cold weather climates use a different gas with a lower boiling point than those meant for hot weather climate (aircondition). But other than that, they work exactly the same.

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  • [–] 1 point 6 hours ago (3 children)

    How hot can this get my water, or are they only meant for forced air?

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