The answer to 'when to replace smoke detector' is that smoke detectors should be replaced every 10 years. Smoke detectors have a limited lifespan and can become less effective over time as the internal components degrade. After 10 years of use, the detector's sensors and other parts may no longer be as reliable in detecting smoke and alerting your family to a fire. Replacing smoke detectors on a 10-year schedule helps ensure your home has functioning, up-to-date fire safety devices.
It's also important to test your smoke detectors monthly and replace the batteries twice a year. If a smoke detector starts chirping or beeping, that's a sign the battery is low and needs to be replaced. Following these maintenance tips will help keep your smoke detectors working properly and protect your home.