A ringing smoke detector is always a serious matter. This is true during a real fire emergency. It’s also true if the smoke detector malfunctions. After all, a security measure so serious should be working properly at all times.

There are times when a smoke detector seems to go off for no reason. One of these times is when it gets cold. The reason might be surprising: batteries don’t operate at optimum performance when they are very cold.

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    Cold Weather and Batteries

    Temperature and batteries have a direct relationship. To understand why, it’s important to know how a battery works. ThoughCo explains:

    “The electric current generated by a battery is produced when a connection is made between its positive and negative terminals. When the terminals are connected, a chemical reaction is initiated that generates electrons to supply the current of the battery. Lowering the temperature causes chemical reactions to proceed more slowly, so if a battery is used at a low temperature, then less current is produced than at a higher temperature. As the batteries run down they quickly reach the point where they cannot deliver enough current to keep up with the demand. If the battery is warmed up again it will operate normally.”

    This explanation proves why a smoke detector goes off in cold weather or a cold home. If the temperature drops, the battery in the smoke detector has a more difficult time keeping it working. When batteries are low, in a smoke detector, the smoke detector usually beeps every few minutes as a signal that the batteries are low.

    The Carbon Monoxide Angle

    There is another time the smoke detector might go off in cold weather. It may seem like a false alarm. However, the alarm might actually be signaling that something serious is happening. Some smoke alarms double as a carbon monoxide detector.

    When it gets cold outside, it’s normal for people to crank up the heat. Furnaces, space heaters, fireplaces — these are some solutions to warming up a home. Sterling Home Inspections explains why this might be a problem:

    “Every fuel-burning appliance in your home, including a gas furnace, produces some levels of carbon monoxide.”

    If it’s not the batteries, it could be carbon monoxide! The presence of carbon monoxide is obviously more serious than low batteries. Even if it’s warm inside, it’s easy to see, now, why the smoke detector might go off if it’s cold outside.

    Smoke Detector Goes Off When It's Cold

    Troubleshooting for Solutions

    The smoke detector might ring if it’s cold inside due to weak batteries. It may also ring if a fuel-burning appliance emits too much carbon dioxide (if the smoke detector doubles as a carbon dioxide detector). Here are a few things to try while troubleshooting the problem:

    • Replace the batteries.
    • Reset the power breaker if the smoke detector is hardwired.
    • Purchase a carbon monoxide detector which shows CO levels.
    • Verify there is no dust or debris inside the smoke detector.
    • Contact the manufacturer if the problem persists.

    Contact Us

    Fire safety is a fundamental part of home safety. At Protect America, we offer home security solutions to include smoke detectors. Our smoke detectors are monitored, which gives an added level of protection. Contact us to learn more about how our smoke detectors would be a great addition to your home security plan. During your call, you’ll get a free quote for our smoke detectors and any additional products you might be interested in.