 Put it in whatever room you need it. It could be the bedroom, the bathroom. It could be the kitchen. It could be the living room, whatever. You put this in there. You'll know where it is because you smell that clean, fresh air that it brings you. And best of all, you don't have to buy filters. That's going to save you a bunch of money, too. You can save $200 on an Edenpure Thunderstorm 3-pack right now for the entire home. You get three units for less.