are merv filters bad for an ac?
I recently had a energy efficiency consultation done at my home. They inspector told me that using MERV rated AC filters is a bad idea because the mesh is so fine than its hard for the system to pull air through it, which can shorten the life span of the air handler. He suggested using the "cheaper" filters and a HEPA unit inside the house if I was concerned with allergens in the air.
I'm not really concerned with allergens that much but I do have a number of animals that shed a lot of hair and dander. Perhaps he's right that it being harder on the unit to use a denser filter, but wouldn't a less dense filter allow more hair and dander through into the air handler? That seems bad too.
I live in Texas where the AC runs quite a bit from June through October. I use MERV-8 filters.