Posted by MarkB_MI on March 29, 2014 at 05:14:34 from (75.198.91.214):
In Reply to: Re: Heat pumps posted by George Marsh on March 28, 2014 at 08:24:02:
George, I don't know the reliability of your source, but it seems to agree with what everyone else is trying to tell you.
"...on a mild day, for example 10 °C, a typical air-source heat pump (ASHP) has a COP of 3 to 4..."
Translation: Under the conditions which heat pumps are designed to operate, they beat the snot out of resistance heat.
"...in extreme cold weather the COP approaches 1."
Translation: Under the worst possible conditions, heat pumps perform no more nor no less efficiently than resistance heat.
Excuse me if I misunderstand your point, but I think you've been trying to say that when it gets really cold resistance heat is cheaper to operate than a heat pump, and that's just not true. Resistance heat is ridiculously expensive, and I'd never own home heated by it in Michigan. (It does work nicely in our Florida condo, by the way.) Now, if you're trying to say that the total cost of ownership for a heat pump is more expensive than resistance heat, I'd say that depends. It's probably true in very mild climates where you don't need air conditioning and seldom need heat. Southern California is the only place I know like that, and even there nobody uses resistance heat since natural gas is readily available.
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