Quote:
Originally Posted by tuccillo
With the 4" media filters, you can typically let them go a year. They actually filter better as they get loaded. If your system is a reasonably new Carrier system, it probably has an ECM motor, which are programmed to deliver a specific number of cubic feet per minute regardless of the static pressure (up to a point). In other words, as the filter gets loaded the fan maintains the same airflow through your ducts. You can visually check the filter and replace when it looks "really loaded". I suspect the tendency is to change the 4" filters before they really need to be changed, particularly if you have previously had a system with 1" filters.
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Thank you for the information. I replace them yearly. Order them on line for 55.00 for two.