Usually, most of the air purifiers available in the market are designed to clean only a single room. So, we would suggest that you keep it in a room where you spend most of your time, in most cases it is the bedroom. Although, if you have a home office or any other room where you spend most of your time, you can place it there. So, the priority varies from customer to customer. Hence, it will be best to purchase an air purifier equipped with wheel at the bottom. Then, you will be able to move is easily from room to room as needed.