If your smoke alarm sounds when it's cold outside, there's a chance it could be something other than a fire.
According to Macomb fire officials, your smoke alarm might sound when it’s very cold outside, or if a door adjacent to a heated area is opened, like in an entryway.
This is due to condensation, or water vapor, in the detection chamber. The sensor is a particle-sensing device and when water condenses in the sensor, the unit will go into alarm.
The operating temperature of a smoke alarm is between 40 and 100 degrees Fahrenheit. If the unit is in a garage or attic, you might want to consider replacing it with a heat alarm, which is not affected by condensation.
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