Safety

Fall Back, Then Check the Alarms: The Clocks-Change Safety List

Mea Cara · October 26, 2026 · 5 min read

Clocks fall back an hour on Sunday, November 1. Fire departments have spent decades attaching one chore to that morning: change the batteries in your smoke alarms. It is good advice, and it is also incomplete. The battery is the part that beeps at 3 a.m. when it dies; it is rarely the part that fails silently. The alarm itself has a shelf life, most houses have too few of them, and the carbon monoxide alarm that matters most in heating season is the one people forget they own.

Here is the whole check. It takes about twenty minutes for an average house, and it is the highest-return twenty minutes on the fall list.

Start with the date on the back

Every smoke alarm has a manufacture date printed on the back, and every one of them should be replaced ten years after that date, whether it still chirps when you press the button or not. The sensing chamber degrades with dust and age, and a ten-year-old alarm can pass its own test and still respond slowly to real smoke. Carbon monoxide alarms have a shorter life, usually five to seven years; the date, or an end-of-life date, is on the back of those too.

Take each one down, read the date, and write it somewhere. If there is no date, it is old enough to replace.

Then count them

The current guidance from the National Fire Protection Association is an alarm inside every bedroom, outside each sleeping area, and on every level of the house, including the basement. Most older houses have one per floor in the hallway and nothing in the bedrooms. A closed bedroom door is excellent at holding back smoke, which is good for the sleeper and bad for the hallway alarm's chances of waking them.

Carbon monoxide alarms go on every level and outside sleeping areas, with one near any attached garage. If you have a gas furnace, gas water heater, fireplace, or wood stove, this is not optional. CO season is heating season, and the symptoms, a headache and drowsiness, look like a cold.

What kind to buy

• Dual-sensor alarms (ionization plus photoelectric) respond to both fast-flaming and slow-smoldering fires. If you buy one type, buy photoelectric; it is less prone to nuisance alarms from toast.
• Sealed ten-year battery alarms never need a new battery and get replaced as a unit. They cost more up front and end the 3 a.m. chirp for good.
• Interconnected alarms, wired or wireless, all sound when one triggers. The basement alarm is of limited use if you cannot hear it from an upstairs bedroom. New construction requires interconnection; retrofitting with wireless-interconnect battery units takes an afternoon.
• Combination smoke and CO alarms are fine where you need both, but remember they expire on the shorter CO schedule.

The battery, since you are up there

For alarms that take a replaceable battery, replace it now and again in the spring, even if the test button works. Use the type the label calls for; a lithium 9-volt lasts longer than alkaline. Hardwired alarms have a backup battery that needs the same treatment. If an alarm chirps right after a fresh battery, the alarm is at end of life, not the battery.

Test the right way

Press and hold the test button on each alarm until it sounds, then confirm that a person in the farthest bedroom with the door closed can hear it. That second part is the test that matters. If they cannot, that is the room that needs its own alarm.

Once a year, vacuum the outside of each alarm gently to clear dust from the vents. Do not paint over them, and do not take the battery out of one that false-alarms near the kitchen. Move it ten feet farther from the stove, or swap it for a photoelectric model.

While the ladder is out

• Check the fire extinguisher. The gauge needle should sit in the green. Most household extinguishers are good for ten to twelve years; the date is stamped on the cylinder. Keep one in the kitchen, one in the garage, and one near the furnace, and make sure everyone in the house knows that you pull the pin and sweep at the base of the fire.
• Change the furnace filter. Clocks-change weekend is as good a schedule as any, and it is close to when the heat comes on for real.
• Replace the batteries in the thermostat if it takes them, and in any flashlight you keep for power outages.
• Walk the escape route. Two ways out of every bedroom, a window that actually opens, and a meeting spot outside. Children should hear the alarm sound once while awake so they know what it means.

What to write down

The location, type, and manufacture date of every alarm and extinguisher. With that list, the ten-year replacement becomes a reminder on a date instead of a guess, and the next time a battery chirps you know which alarm it is before you climb the ladder. The furnace filter size belongs on the same page.

That is exactly the kind of list HavenBinder keeps: each alarm as an item with its date, a repeating reminder for the battery swap, and the ten-year replacement waiting on the calendar. It is free to start. The alarms are the first stop on the winterizing checklist, and if you have never checked whether the alarms or any other appliance have been recalled, this guide covers it in ten minutes.

#smoke alarms #carbon monoxide #safety #daylight saving