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Heat pump defrost cycle mode

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Hi, I have 3.5kw air condition and in heating mode it goes in defrost mode every 10 min (Out side temperature is about (-5 C) 23F.
asked in Heating and AC by cobet (120 points)
edited by darekrudy
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1 Answer

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I believe you’re asking about a heat pump that goes into a defrost cycle.
Yes, under normal circumstances (all of the heat pump components are operating properly) the defrost cycle on some (usually older) models will repeat on regular basis at timed intervals. This is to maximize heat pump’s efficiency in low ambient temperatures by melting icing / frost forming on the outdoor coil.

However, those timed defrosting cycles aren’t always that energy efficient because they operate regardless of frost / ice presence on the coil. Not much you can do about it if your heat pump has been designed that way.

Other heat pump designs will have defrosting mode activated when needed / only when the outdoor coil starts frosting.
answered by darekrudy (21,730 points)