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About 10% during the outdoor temperature from about 40 degrees to 20 degrees. Not a lot beyond those temperatures that make frost on the outdoor coil...assuming you have a unit with a good electronic defrost control.

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Q: How much energy is needed for a heat pump defrost cycle?
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Related questions

How do you adjust a heat pump defrost cycle?

Call an HVAC technician


Heat source that powers nature water cycle?

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