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worstatit t1_j1lykcc wrote

Reply to comment by Mijbr090490 in Asked to conserve electricity on Christmas eve. What is even going on anymore by CoolHandMike

Heat pumps lose much efficiency at 40 degrees, substantially so at 28 degrees. We're at 13 here, after hitting 1 degree for the last 24 hours. Throw in some high winds.

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Mijbr090490 t1_j1lznq3 wrote

Technically true, but they maintain 100% efficiency. Modern cold weather and geothermal units can handle these conditions with no sweat.

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worstatit t1_j1m3uxt wrote

Perhaps. My experience with geothermal is peripheral with an older commercial system. The original bid called for an auxiliary heat boiler, the geothermal guy claimed it was unnecessary. It was left out, then installed at far greater cost later on after the geothermal continuously burned up pumps and blew breakers every winter. I believe the cold weather units you refer to carry conventional heaters.

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