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I don’t measure or actively mitigate carbon dioxide; however, we do run particulate filters 24/7. No central air, but we use a large window fan to pull fresh air into the house during the summer months.

Winter is the real concern. Not much opportunity to air out the house when the temp is consistently below 20 degrees Fahrenheit.

I supposed I should look into a heat exchanger.

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> "I don’t measure or actively mitigate carbon dioxide; however, we do run particulate filters 24/7."

this is the right order of concern. pollution (particulate matter) is much more damaging to our tissues than CO₂, which is basically inert in comparison (e.g., people die of smoking, not working in a stuffy office). life evolved alongside CO₂, but not so much alongside NOₓ, SOₓ, CFC/HFCs, dioxins, and the like. but in every thread about air quality, the majority of the discussion is on CO₂. the mediopolitical narrative is driving hard in this direction, to our detriment, as plainly evident here.

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