In browsing house listings, I found a place that claimed to have an "advanced ventilation system (AVS)" installed. Having no idea what that was, or if it was for real, I did a search and found a store, Conservation Technologies, that has a few filtration products that look interesting. Interestingly enough, they're based in Duluth, MN.
The brand name is distinct, so I further searched on that and found the manufacturer's site: Venmar, in Canada. The site describes a Heat Recovery Ventilator, which apparently takes stale indoor air, uses it to cool fresh outdoor air, and expels the stale air while passing in the fresh air. That might be useful for the house I end up buying.
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