Asked: Why is my smoke alarm going off?

We went over to a friends house and when we came back the smoke alarms were going off like crazy. It seems to always happen when its cold outside, I don't understand it?! We already just a couple of weeks ago replaced the batteries. What are suppose to do?


Dust will set them off, did you clean it when you replaced the batteries?I vacuum mine to keep dust out, it helps.

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