You might think that a home can never be too airtight; after all, everyone knows that sealing cracks and eliminating drafts is the surest way to greater heating and cooling efficiency. However, there is a certain amount of air flow that any home requires to remain fresh and functional. In other words, even your house needs to breathe! Keep reading to learn why this is the case and how to tell if your castle is too impenetrable for its own good.