Carbon monoxide has no smell you can rely on. A CO alarm is there to
warn you about a dangerous condition, but it only helps if it is
installed, powered, and within its service life. I treat it as its own
maintenance item, separate from smoke alarms, even when both functions
share one device.
Make a list of the CO alarms and combination units in the house. Test
them with the manufacturer’s procedure, check their expiration or
replacement date, and follow the model’s battery instructions. Placement
depends on the device, the home, and local rules. Don’t improvise a new
location based on a social-media diagram. If you’re adding alarms,
review the installation directions and current local requirements.
An alarm is an
event, not a repair reminder
If a CO alarm sounds, move everyone to fresh air and call emergency
services or the fire department from outside. Do not silence it and go
back to bed or try to find the source yourself. The
U.S. Fire Administration’s CO guidance covers the hazard and
response. Fuel-burning appliances and attached garages are reasons to
take the warning seriously.
Have a qualified contractor assess any fuel-burning equipment that
needs service, and a qualified electrician address hardwired alarm
issues. The homeowner’s part is to keep the alarms tested and their
dates visible. A working alarm doesn’t replace proper appliance
maintenance or venting.
I keep local professional contacts on Helpful
Resources and alarm-related picks on my Homeowner
Tools & Supplies page. Confirm a product’s current listing and
fit for your home before buying.