I don't see any actual comparison to fossil fuels. They use a measure, COP, which is coefficient of performance, which doesn't seem applicable to fossil fuel furnaces or if applied there would give those furnaces an enormous COP number.
Anyways, I don't understand the need to draw these types of "total" comparisons. If you have reliable electricity, a heat pump is probably great, if you don't, then fossil fuels are clearly the way to go.
Anyways, I don't understand the need to draw these types of "total" comparisons. If you have reliable electricity, a heat pump is probably great, if you don't, then fossil fuels are clearly the way to go.
There is no "one size fits all" energy strategy.