How often should I change the batteries in my smoke detectors?

If your detector is powered solely by the air conditioning current in your house, there is no battery to change. However, if your detector is battery powered or has a battery backup power source, it is recommended you change it at least once a year. Pick a birthday or memorable day, such as New Year's Day to ensure you remember this change.

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1. How often should I change the batteries in my smoke detectors?
2. How long do smoke and carbon monoxide detectors last?
3. How many smoke detectors do I need in my home?
4. My smoke detector is chirping, what does that mean?
5. What type of smoke detector should I have in my home?