> you'd still have to pay your electricity bill. I should only have to pay 1/3 of what it adds to my bill, given that it's 1/3 as efficient as a heat pump. And

> you'd still have to pay your electricity bill. I should only have to pay 1/3 of what it adds to my bill, given that it's 1/3 as efficient as a heat pump. And that coefficient is to be adjusted as outside temp changes (assuming air source heat pump; water source would have a stable COP).