These filters work great and are less than half the price my air conditioning service company charges for the same Lennox filter. However, if you have a Pure Air system, I would recommend spending $20 more and getting a Lennox X8795 or Lennox x8796 maintenance kit (if it fits your system). $60 separately and a titanium coded metal filter that costs $90 separately. You can replace all three components of your clean air system for $130 and still spend half what an air conditioning guy would charge you for just a filter. It is recommended that these parts be replaced annually so I would do this at least every 2 years unless you have very heavy A/C usage or are having issues with debris getting into your A/C from your attic or garage. Then yearly is best.
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