It's a simple formula, the CoP, I linked it in my above post. The below PDF has a chart of temps to efficiencies. 47F will be around 100% efficiency or a CoP o

It's a simple formula, the CoP, I linked it in my above post. The below PDF has a chart of temps to efficiencies. 47F will be around 100% efficiency or a CoP of 1. New York winter days are generally below that. https://www.energy.gov/sites/prod/files/2017/04/f34/2_32219_Shen_031417-0900.pdf https://www.energy.gov/sites/prod/files/2017/04/f34/2_32219_... That's a potential 40% energy loss. 20% at the plant, 20% at the house. It all depends on the region's temperature. Electric heating is more efficient in some places, less efficient in some, and equal in some. For New York, it does not make sense to use a heat pump: https://www.currentresults.com/Weather/New-York/Places/new-york-city-temperatures-by-month-average.php https://www.currentresults.com/Weather/New-York/Places/new-y...