Ugh, I hate spiders!! You should use one of those slide-thru doors that allows you to walk through them and bring fresh air in and those dumb old spiders & bugs can't come in ! :) Look at your local store, when I went to Walgreens they had some.
Ninety-eight percent (or thereabouts) of spiders are harmless to humans, and are beneficial as they capture and eat bugs (insects). When I find a spider in my house, I check to make sure it's not a Brown Recluse or a Black Widow, and if it's not, I let it go on its merry way.
I've never had an unwanted close encounter with a spider, but I've had hundreds with flies, mosquitoes, moths, water bugs, earwigs, and other squiggly six-legged home invaders. I think it's prudent to protect the creatures that eat bugs--I would love it if a couple of bats made a home in my backyard. Bats eat thousands of insects every night. I could really use that kind of help in controlling biting flies and mosquitoes!