Why is my smoke detector beeping?

Usually a smoke detector that "chirps" or "beeps" about every minute needs a new battery. Batteries in smoke detectors should be replaced twice a year, traditionally on the days you set your clock forward in the spring and back in the fall. If it continues to chirp after you replace the battery, it may indicate a malfunctioning smoke detector. New smoke detectors can be purchased at hardware stores or department stores.