Am very happy with these filters and will continue to buy as long as the price is right. I originally bought a 14MERV filter for my home but the price difference was significant and I received advice from a trusted source in the HVAC industry that higher MERV ratings can actually make your air handling units work harder as a shallower one Environment can reduce airflow, especially on cheaper models. I use these 12 MERV carbon filters to remove odors from the air and change them every 6 months. I suspect I can last up to a year on a filter, but at $30 a filter, replacing it every six months is only $5 a month, and I'm fine with that. I've seen their prices fluctuate wildly, so I try to stock up whenever they drop and put the annual cost aside at once. Well worth it, no complaints and will buy more in the future!
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