Smoke alarms and carbon monoxide (CO) detectors are two of the most important safety devices in any home. Yet many homeowners and renters forget to test, clean, and replace them properly. Regular maintenance ensures these life-saving devices work when you need them most.
If you’re wondering how often to check smoke detectors or when to replace carbon monoxide alarms, this guide will walk you through best practices.
Why Smoke and Carbon Monoxide Detectors Are Critical
Smoke alarms provide early warning during a fire, giving families valuable time to escape. Carbon monoxide detectors alert you to a colorless, odorless gas that can cause serious illness or death if undetected.
Common sources of carbon monoxide include:
- Gas furnaces
- Water heaters
- Fireplaces
- Gas stoves
- Vehicles running in attached garages
Properly functioning detectors significantly reduce the risk of injury and property damage.
How Often Should You Test Smoke Alarms?
Test smoke alarms at least once per month.
To test:
- Press and hold the test button until the alarm sounds.
- Confirm the sound is loud and clear.
- If no sound occurs, replace the batteries immediately.
- If it still fails, replace the unit.
You should also test alarms:
- After replacing batteries
- After power outages
- After installing a new unit
How Often Should You Replace Batteries?
Replace batteries in smoke and carbon monoxide detectors:
- At least once per year (unless using 10-year sealed units)
- Immediately if the device chirps
- After a low-battery warning
Many people change batteries when adjusting clocks for daylight saving time as a reminder.
When Should You Replace Smoke Alarms?
Smoke alarms do not last forever. Replace them:
- Every 10 years from the manufacture date
- Sooner if malfunctioning
- Immediately after fire damage
Check the manufacturing date on the back of the unit. If it’s over 10 years old, it’s time for replacement.
When Should You Replace Carbon Monoxide Detectors?
Carbon monoxide detectors typically need replacement every:
- 5–7 years (check manufacturer guidelines)
CO sensors degrade over time, even if the alarm still powers on.
Where Should Detectors Be Installed?
For maximum protection:
Smoke alarms should be installed:
- Inside every bedroom
- Outside sleeping areas
- On every level of the home
Carbon monoxide detectors should be installed:
- Near sleeping areas
- On each level of the home
- Near (but not directly next to) fuel-burning appliances
Avoid installing detectors in kitchens, bathrooms, or near HVAC vents where false alarms may occur.
Maintenance Tips to Improve Performance
In addition to testing and battery replacement:
- Vacuum vents twice per year to remove dust
- Keep units free of debris
- Never disable alarms permanently after nuisance alerts
- Replace damaged or discolored units
Routine maintenance ensures accurate detection.
Why Proper Maintenance Matters for Homeowners and Renters
Maintaining smoke and carbon monoxide detectors protects:
- Lives and personal safety
- Your home and belongings
- Insurance claim eligibility
- Liability exposure
In the event of a fire or CO-related incident, properly functioning detectors can reduce loss severity and may play a role in claim investigations.
Final Thoughts
Smoke alarms and carbon monoxide detectors are small devices with enormous impact. Testing monthly, replacing batteries annually, and installing new units at recommended intervals are simple steps that can save lives.
Taking just a few minutes each month to check your alarms ensures your home remains protected against two of the most dangerous household threats.
If you haven’t tested your smoke or carbon monoxide detectors recently, now is the perfect time.