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With 410 refrigerants air to air hp's are much more efficient than there predecessor R 22 units and can run down to 14 deg f with a COP of 2.5 or so.
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Great info. My new place has a HP with oil backup. The oil seems the oil kicks in around ~40 deg outside, I'd love to figure out how to get it to work longer. Not as bad as propane, but oil is $$. Ouch. The woodstove is working overtime this winter.