"I'd like more info on your whole house filter system. It doesn't seem to be doing enough. Is it a media filter? What MERV level of filter are you using now. ? Is it showing any build-up? What size is it. 4". 6" 12" thick ridgid cell. Have you changied it?"
It's a Honeywell high-efficiency, 4 inch, MERV 11. It's this one: F100F2025/U Filtration | Honeywell Home
It was just put in end of summer, so no need to change it yet. I was in the habit of changing the filters September and March on the AprilAire in the other house instead of once a year, which I'll continue to do.
"Wall-to-wall carpet can generate, catch, hold, and send out an amazing amount of house dust."
No carpet inside my home other than rugs/mats in front of entrances and the kitchen sink and stove.
Q