Diego Brown Geothermal Heat PumpsSystem Operating Costs Energy source Formula for cost per million Btu Cost per million Btu Propane (11.1 x cost/gallon) / efficiency $ 32.11 … Visit Document Heat pumps – Efficient Heating And Cooling Solution For …Heat pumps – Efficient heating and cooling solution for buildings Prof. dr. eng. IOAN SÂRBU, Assist. [...]
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