What Happens When Your CO Alarm Goes Off and Nobody Wakes Up?

A carbon monoxide alarm can’t save you if nobody hears it. When we tested the best CO detectors of 2026, we looked past loudness to what happens after the alarm sounds. ADT came out on top, with a monitoring center that responded within 30 seconds and can dispatch emergency services even if nobody answers. Vivint can automatically unlock doors and disarm window sensors so your family can evacuate. No subscription? First Alert and Kidde detectors send app alerts with no monthly fee, but can’t call for help. Find more home safety resources at Security.org.