Swallows (the birds) can build nests around your home with mud and straw- sometimes harboring mites and bedbugs. So it's best to just keep your home clean all around. I mainly bring fleas from the chicken coop inside my room; but since I vacuum, all is well. I've never had mites in my house (or...
Yes clean the coop. Wood coops have more of a problem with mites because they have those little nooks and crannies in them. Be sure to rinse the roost and the laying boxes.
Since this sounds more of a big infestation, I'd use chemicals first like "Adams PLUS Flea and Tick Mist" you can...