I had the same question. Don't most homes in Ohio (where the show is set) have basements? If so, wouldn't that be a better alternative to Al and Riley living in the garage? It gets very cold in the Midwest so it would be a poor choice as the garage door doesn't even have a thermal barrier. And yes, I understand it's just on a soundstage in California. I guess it saves the production company the cost of building and furnishing a separate basement set.