Quote:
Originally Posted by Michael G.
Carrier installer said unless you have a cat or dog, the 4"filter
that came with my system should be changed once a year.
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We have no animals, are not smokers, and keep a clean home. That being said, 12 months for us is too long between changes. I find six months to be about right, but that time frame can vary based on the time of year. Another thing to consider is if you burn candles, that’ll shorten the time frame between changes. YMMV