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Replying to @RichardMeyerDC
Any heat pump operating at COP > 2.37 in the SRSO regional grid, which includes Alabama, produces fewer GHG emissions than natural gas heat. Avg SRSO Emissions are 523/grams/kWh_e. Divide that by 221/grams/kWh_t for gas heat and you get "Break Even COP" of 2.37.
10:58 PM - 14 Feb 2019
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