Online is much cheaper. If you have allergies don’t buy anything less then a Merv 13 filter which is a pretty good one. They will last an entire year. I have bad allergies and buy Merv 16 which is just about the best you can get. Costs me $90.00 bucks but to me it’s worth it. Be sure to measure your existing one carefully. You can try Filters.com or discount filters.com.
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