We all know about replacing the batteries in your smoke detectors, but why replace the whole unit if it's ten years old or more? Sounds like something they came up with to sell more smoke detectors! It's not. It turns out the sensors can start to go bad or even fail when a unit has been patiently monitoring your household air quality for a decade or more. Keep this in mind also if you are a landlord. Are those smoke detectors up to date and working? As someone who has lived through a house fire in the middle of the night, I am a believer in smoke detectors! Even Benton County Fire Dist. #1 is spreading the word...