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I assume your HVAC returns from the house to the basement cooled/heated then sent back up to the house. I'd be checking the return ducting for opening that basement air is getting in. If your basement is art of the HVAC being cooled/heated then there will be a return duct somewhere down there drawing in air, find it, put a filter over it.
#HappyMonday @Bill.de.Cat ...we survived another week.......time for an extra #Smokebreak huh...?