I have a ranch style home with a full, unfinished basement. Should I use this area or the actual living area?

Hi, thank you for reaching out! Place the kit in the lowest lived-in area of your home. This means the lowest level that is regularly occupied. If your basement is unfinished and rarely used, test in the main living area instead. If you spend time in the basement (laundry, storage, hobbies), then test there. If further questions arise, our technical support team is available and ready to assist. You can reach us 7 days a week via phone at 1-800-323-9005.— Charlie