My good friend Joe hijacked another thread with some excellent comments on CO detectors. I'd like to create a topic-specific thread here and explore it a bit more. Where should you install smoke and CO detectors to maximize effectiveness and minimize false alarms? I have a CO detector on our main living level, but none in the basement where the boilers are. I have smoke detectors on every level, but none in the boiler room itself. Should I be doing anything differently?