The $15 Part That Kills More Furnaces Than Anything Else

Get The 30-Year HVAC Bible — Make Your Heating And Cooling System Last Decades Longer → https://liibro.com/l/hvac/john-the-hvac-guy A clogged or overly restrictive furnace filter is responsible for more heating system failures than almost any other single cause, yet most homeowners never hear the full story. This video explains exactly how a fifteen dollar air filter quietly destroys a furnace over years, walking through the four components it takes down in sequence: the high limit switch, the blower motor, the air conditioning coil, and finally the heat exchanger. You'll learn why thin modern heat exchangers are especially vulnerable to restricted airflow, what temperature rise means and how to measure it yourself with two basic thermometers, and why higher MERV ratings don't always mean a better filter for your system. The video also covers why a California regulation passed in 2024 now requires filter manufacturers to print airflow resistance on the frame, a number that tells you what the MERV rating never does, and what that says about how filters have been marketed for decades. #hvac #furnace #homeimprovement #airfilter #heating #homerepair #diy #winterprep #energyefficiency #carbonsafety