Why does my outside coil onmy warmness pump freezes up at dark when heat falls below 40 degree? ...

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Answers:    your outside coil removes the cold, if it is too cold out a heat pump cannot remove any cold nouns from your home
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Heat pumps are not effective within colder weather, that is why most homes near a heat pump also own an auxillary heating system for when the warmth drops below its effective scale.