Quote:
Originally Posted by Chatbrat
Use a MIRV 11 or a better Merv 13, in a designer change them once a year--if you use a Mere 8-change it every 6 months
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I look at my A/C filter each month when I put vinegar in the drain pan. I think I end up changing it ever two to three months. Hold the filter up to a light and do the same with a new one to help tell if it is dirty.