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How do I determine the maximum theoretical coefficient of performance for a heat pump operating at steady state between a dwelling at 70 deg F and a pond at 40 deg F?

For the dwelling, if heat transfer through the walls and roof is 6.5x10^5 Btu per day, how would I determine the minimum theoretical power, in hp, to drive a heat pump operating at steady state between the dwelling at 70 deg F and a pond at 40 deg F?

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The maximum theoretical coefficient of performance (COP) is the Carnot COP:
COPHP,Carnot = 1/(1-TL/TH)

Reference: Thermodynamics - An ...

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