The answer to 'lifespan of carbon monoxide detector' is that most carbon monoxide (CO) detectors have a lifespan of 5-7 years. CO detectors contain sensors that can deteriorate over time, so it's important to replace them regularly to ensure they continue to function properly and provide reliable protection for your home.
Most manufacturers recommend replacing CO detectors every 5-7 years, or sooner if the detector starts chirping or giving other indications that the sensor is failing. Some higher-end models may last up to 10 years, but it's best to follow the manufacturer's guidelines for your specific detector. Regular testing and maintenance can also help extend the lifespan of your CO detector.