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NATE Gas Heating Exam (Already Passed!)
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Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than: A: 70% B: 75% C: 78% D: 80% correct answers C: 78% Many pre-1992 furnaces have efficiencies around _______. A: 10% B: 40% C: 60% D: 80% correct answers C: 60% Today, furnaces with AFUE ratings greater than _____ are available. A: 85% B: 90%
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since 1992 the united states department of energy
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