and squirrels will be active chewing up vents. Also, its going to start to cool, and this is when rodents start to look for warmer places to go at night, primarily your home. Don’t let your vents become a door into your home or a chew toy for a squirrel. Protect them with Critter Quitters. Available at The Home Depot.com or Amazon, or your local pest control operator may use them when he does a rodent exclusion.