re: When did A/C air filters get so dang expensive?

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f you are using 1 inch thick high MERV filters, MERV 12 from Filtrete for example, you are restricting airflow to your HVAC - which is not good for the system. The purpose of 1 inch filter thick filters is to protect the HVAC equipment - not improve indoor air quality (IAQ).

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Every a/c guy i've talked to says the opposite. Modern a/c units have more than enough power to run a MERV 12 return duct filter, and they absolutely reduce indoor pollutants. I think this an outdated line of thinking (if it ever was true).

I buy Nordicpure filters from amazon by the 6 pack. I think they work out to about $6/filter for a higher MERV (I think i use 9 or 10). Amazon also has their own brand filters for about same price, but I've always been pleased with the nordic pures. The filters at big box stores are a rip off ($10/filter and up generally)

My whole house has allergies, otherwise I'd run MERV 7 or 8.