In my Civil War cabin I use
Merv 16 , changing huge filter once a year
I never open my windows, but have a very leaky home, which I prefer
I run a big humidifier inside my darkroom in that house all winter, it drinks 5 treated gallons a day
My 'LEEDS' no fresh air Chicago condo, I had to punch drywall holes to access the roof and ran roof humified all winter
Still had dust, so I used a 5 filter canister filter, $1000 per filter change
Best in World
IQAir
After 5 years, it cured my factory cough
Then I gave it to my daughter to use in their moldy basement
Really glad I made money on the ART COOP disaster
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