While the condensing furnace is different in design and repair needs, it has a few similarities to a traditional furnace. They both take in cold air from your home and run it through an air filter. They move the air using a circulating fan and have a burner with electronic ignitions, even though condensing furnaces come with more electronic controls. They have multiple similar components. The heat exchanger is a crucial component in condensing furnaces. They come with two heat exchangers, primary and secondary heat exchangers. The primary heat exchanger is a coated steel tubing that is responsible for creating heat. The secondary heat exchanger has small tubes that collect the exhaust gases once they exit the primary heat exchanger. The secondary heat exchanger works to extract heat from these exhaust gases before they are vented outside your home. The condensate drain line is the component responsible for draining the carbonic acid condensate produced while the secondary heat exchanger extracts heat. This by-product is drained through the condensate drain line into a floor drain. Your condensing furnace utilizes a two-stage burner gas valve, which comes with electronic controls that enable your burner flame to run at either low or high settings, depending on the amount of heat needed. Condensing furnaces also use electronic ignition for maximum reliability and efficiency. It utilizes a sealed combustion chamber. The combustion air intake is typically piped from your home’s exterior to the furnace. This setting prevents your furnace from pulling in the air that is already heated by your condensing furnace.