A condensing gas furnace uses efficiency from a condensing type heat exchanger to increase the furnace____.

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Multiple Choice

A condensing gas furnace uses efficiency from a condensing type heat exchanger to increase the furnace____.

Condensing furnaces boost efficiency by recovering latent heat from the exhaust. As the hot combustion gases are cooled in the condensing heat exchanger, water vapor condenses and releases latent heat, which is then added to the heated indoor air. This extra energy isn’t just a temperature rise (sensible heat) but energy released during a phase change, which is why it increases overall efficiency. Radiant heat and chemical heat aren’t what the condensing process primarily uses, so latent heat is the correct focus.

Condensing furnaces boost efficiency by recovering latent heat from the exhaust. As the hot combustion gases are cooled in the condensing heat exchanger, water vapor condenses and releases latent heat, which is then added to the heated indoor air. This extra energy isn’t just a temperature rise (sensible heat) but energy released during a phase change, which is why it increases overall efficiency. Radiant heat and chemical heat aren’t what the condensing process primarily uses, so latent heat is the correct focus.

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