We use this brand, size and filtration strength filter most often and thus far have found it does not make our HVAC motor work too hard, which is always a big concern when choosing which strength/level to get for HVAC units. I have used lesser strengths, which typically require more frequent changing, (but are also more budget-friendly in a pinch), and often don't filter the air as well as this. Having a smoker and a cat in the home, as well as living in a farming (lots of animals, plants, trees and other allergen-producing things) community, air quality is a big concern, bu this seems to keep the air sufficiently filtered. As of this current writing, we have found the 2 pack to be more cost-effective than purchasing separately, which is a concern because we have 2 HVAC systems, one for upstairs, one for downstairs. So far, so good, we like the 3M brand for our filters when we can get them, and it's the first brand I look for when it's time to replace them.
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