How often do carbon monoxide alarms need to be changed?

Carbon monoxide alarms are required to be replaced every 7 years. However, those that are battery powered, or have a battery back-up need to have their batteries changed at the same time that you change your smoke alarm batteries. To help remember when to change your batteries, remember the phrase “Change your clock, change your battery”, as these both need to be changed at about the same interval.

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1. How can you avoid carbon monoxide poisoning?
2. What is the best carbon monoxide alarm to use? Are there different kinds?
3. Where do I install my new carbon monoxide alarm?
4. How often do carbon monoxide alarms need to be changed?
5. Where do I install smoke alarms?
6. How often should I replace the batteries in my smoke alarm?
7. What maintenance do my smoke alarms need?