APOD Firearms

Recent content by mattpepper97

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    1. M

      HVAC question about heat pumps, how cold will they work without using the backup electric heater?

      That is probably about the limit for 100% but there are some units like Bryant/Carrier variable speed units that can operate down -15 or so before you have to rely solely on electric backup.
    2. M

      HVAC question about heat pumps, how cold will they work without using the backup electric heater?

      -15 to -18 is where the best heatpumps become ineffective at drawing heat out of the air. The best units out their can probably maintain temp in a house down to around 15 without electric backup. That said it depends heavily on set temperature, insulation, and how much air leakage you have. Also...
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