Radon Check
It is very important that you have your house checked for radon, as it is a very toxic gas that you probably will not even notice is in your home until it is too late. You can purchase radon plug ins and whatnot that regularly monitor the air in your home, but you should definitely still consider having your house completely checked out by a professional every once in a while. I know we use the radon plug in monitors in every room, but you never know when it is time to get a new one, unless you pay a good bit of attention to when you purchased the last one.