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43. You operate a store that's heated by a gas furnace that supplies ENV 24.4 kWh of heat from every hundred cubic feet (CCF) of

43. You operate a store that's heated by a gas furnace that supplies ENV 24.4 kWh of heat from every hundred cubic feet (CCF) of gas. The gas costs you $1.28 per CCF. You're considering switching to a heat-pump system powered by electricity that costs 14.60 per kWh. Find the minimum heat-pump COP that will reduce your heating costs

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