So the calculation is not that easy and I'm a little skeptical of the numbers in ishoot's link. Electric rates have skyrocketed this year, especially in Mass. due directly to Gov. Patrick's clean air initiative and the resultant closing of coal plants. Add to that a shortage of natural gas when temps approach 20 degrees and electricity becomes very expensive. ( the gas plants have to switch to diesel so that pressure can be maintained for NG heating customers). Also heat pump output diminishes below 40 degrees, regardless of technology, there is just less heat available in the air.
I don't have time to calculate the numbers right now but I don't think the difference is as great as that link alludes.
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