Hope some one can answer this.

I've figured out how to compare the cost per BTU of propane versus electrical heat.

Now for the heat pump. The best I can find has to do with the coefficient of performance (COP). I've found a statement that todays heat pumps have a COP between 2 and 5.

Is it correct to understand then that for each BTU of electricity that goes into a heat pump, it puts out twice as many BTU if it is rated as a COP of 2, three as many if COP of 3 etc.?

Help me understand this.

I understand the SEER rating part.

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