You’ve probably heard of condensing furnaces, but aren’t entirely sure how they work. First, though, here’s a refresher on how a conventional old-style gas furnace works: airflow is drawn in through the cold air return and air filter, and then into the circulating fan. Heat from the gas burner flows into the heat exchanger, heating the surrounding air before it’s circulated throughout the house via the ductwork. Combustion gases generated by the burner are vented out of the home through the flue.

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Tags: AFUE ratings, California, condensing furnaces, energy efficiency, Fresno, heat exchanger
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