Mr. and Mrs. Martin's home is heated by a natural gas furnace and has an Annual Heat Loss of 79,081,683.91 BTUS. Natural gas in their area costs $1.269/CCF and has a Heating Value of 100,000 BTUs/CCF. The Martins recently purchased a furnace for their home that will result in an Annual Heating Cost of $1080. What is the efficiency of the Martin's new furnace?
Amount of Natural gas that was burnt in new furnace = 1080/1.269 = 851.0638298 CCF = 851.0638298 x 100,000 BTU = 85,106,382.98 BTU
' Efficiency = 79,081,683.91 / 85,106,382.98 x 100 = 92.92%