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Furnace vs Air Handler: What Each One Does and Which Your House Needs
A furnace makes heat; an air handler moves air for a heat pump or AC and may add electric heat strips. How to tell which one you have and which one a new s
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How Furnace Ignition Works: Hot Surface Igniter, Spark Igniter, Pilot Light and Flame Sensor
How a gas furnace lights: hot surface igniters, spark igniters, standing pilots and the flame sensor that proves the fire. What each looks like, how long i
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How Does a Gas Furnace Work? Burners, Heat Exchanger, Blower and the Safety Chain
How a gas furnace turns a thermostat call into warm air: ignition, burners, heat exchanger, blower, venting and the safety switches that watch every step.
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What Is a Condensing Furnace? The Second Heat Exchanger, the Drain and the PVC Vent
A condensing furnace pulls extra heat out of its own exhaust with a second heat exchanger. How it works, why it drains water, why it vents through plastic
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