In Eastern MA electric is 26 kwh, and $15.00 per thousand cubic feet as per January 1st. Most natural gas furnaces are between 80-90% efficient, but to get abo

In Eastern MA electric is 26 kwh, and $15.00 per thousand cubic feet as per January 1st. Most natural gas furnaces are between 80-90% efficient, but to get above 80% you need to have a high power electric fan. Which would put them roughly at 6 cents per kwh or (0.0625 for 80%). At COP of 3, that would mean 8.66cents per kwh, and a COP of 4 would be 6.5. Which would roughly be breaking even compared to 80% efficient furnace.