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When a carbon monoxide alarm goes off, you should always take it seriously. Infrequent and occasional chirps often point to a low battery, a faulty device, or dust buildup (this usually affects smoke detectors and not standalone CO detectors). A continuous alarm signals an emergency, and you should immediately evacuate and call 911. When it comes to carbon monoxide in your home, it’s better safe than sorry.

Yes. It’s okay to leave a pellet stove on overnight, and these stoves can provide 24 to 48 hours of warmth from one ignition. However, you should practice proper pellet stove maintenance, like cleaning the burn pot before each use, deep cleaning the unit at least once per year, and running the fan when the stove is lit.

A smoke alarm that beeps periodically, often every 30 to 60 seconds, usually indicates a low battery. The first step is to replace the battery. If this doesn't solve the problem, try resetting the alarm. However, beeping can also signal other issues, such as dust buildup in the sensors or the unit reaching the end of its life. Different beep patterns can mean different things; for example, multiple beeps might indicate an issue with a combination carbon monoxide detector, while a continuous, loud alarm means smoke has been detected. If a new battery doesn't stop the beeping, it's best to consult your alarm's manual, call a professional, or replace the unit.

The National Fire Protection Association (NFPA) says you can place smoke detectors on either the ceiling or the wall, depending on the setup of your room. Since smoke rises, the ceiling makes sense, but if you go with a wall mounting, the alarm should be installed high up—no less than 12 inches from the ceiling.