Change your cabin air filters! I feel like I take reasonable care of my cars, and knew this needed to be done regularly, but just wasn’t getting around to it. Had the week off with no big plans, so did a lot of little stuff.
Let me assure you they looked much worse up close. Both cars cool appreciably better. Both were out and in in less than 5 minutes. Flex the sides of the glove box in so it can open wide for access to the filter. Old one out, new one in. Pushed sides of glove box in so it can get past the stop.