Filter, shmilter. Why do we have to change those pesky things so regularly? Well, the filter in your HVAC system has two main functions-first, it improves your home's indoor air quality. (By the way, the EPA estimates that the air inside your home can be 2 to 5 times WORSE than the air outside!) And second, it can keep your entire HVAC system clean. Dirt can clog your furnace's secondary heat exchanger or your a/c unit's evaporator coil. Either way, air flow gets restricted, and can cause overheating and premature failure of parts and even the entire system.
--Kudzu
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