Test Your Smoke & CO Detectors (and Replace the Batteries)

We'll keep this one straight and simple, because it's the most important thing here: a smoke or carbon-monoxide detector only saves your life if it's working. They're cheap, they're easy to maintain, and yet the saddest fire and CO stories almost always include a detector with a dead battery or one that was years past its expiration. Five minutes of attention is all it takes to never be that story.

Why both — and why CO is the silent one

Smoke detectors give you the early warning to get out during a fire — minutes that genuinely save lives. Carbon-monoxide (CO) detectors guard against something you can't see, smell, or taste: CO is a colorless, odorless gas produced by anything that burns fuel — your furnace, water heater, gas range, a car running in an attached garage, a fireplace. A cracked heat exchanger or a blocked flue can fill a home with it, and the early symptoms (headache, dizziness, sleepiness) feel like the flu, so people don't realize what's happening. A working CO alarm is the only thing that catches it. This matters most in heating season, exactly when your fuel-burning appliances run hardest.

Where they belong

Coverage is about placement, not just having a few. The widely recommended layout:

• A smoke alarm on every level of the home, including the basement.
• One inside each bedroom and one in the hallway outside the sleeping areas.
• A CO alarm on every level and near the sleeping areas — so it can wake you.
• Keep smoke alarms off the very corner of a ceiling and away from kitchen steam and bathroom humidity (those cause false alarms, which is why people disable them — a mistake).

Combination smoke/CO units are a tidy way to cover both in one device near bedrooms.

The simple routine

• Test every unit monthly. Press and hold the test button until it sounds. That's it — it confirms the horn and circuitry work. Do it the same day you do another monthly habit so you remember.
• Replace batteries at least once a year (or the moment one chirps that low-battery warning). An easy memory trick people use: change them when the clocks change. For units with sealed 10-year batteries, you replace the whole unit instead.
• Vacuum them now and then. Dust and cobwebs can keep a sensor from reading correctly.
• Know their age. There's a manufacture date on the back. Smoke alarms expire about every 10 years; CO alarms about every 5–7 (check yours). The sensors wear out — an old alarm can look fine and still fail. When in doubt, replace it; they're inexpensive.

Know when to call a pro

Testing and battery-powered units are all DIY. Call a licensed electrician — or us to coordinate it — when:

• A hardwired alarm keeps chirping or going off even after a fresh battery — hardwired and interconnected units (where one trips them all) involve your home's wiring.
• You don't have CO alarms near the bedrooms, or none at all — get that handled right away, especially with gas appliances.
• You want interconnected alarms so that one going off sounds them all — a real safety upgrade that's a wiring job.
• A CO alarm has actually triggered — after everyone's safe, have a pro inspect your furnace, water heater, and flues to find the source. CO means something that burns fuel isn't venting right.

Everything up to the wiring is yours, and we hope you never need us for the rest. But if a CO alarm has gone off, don't stop at resetting it — the alarm did its job; now find out why. We can help coordinate getting your fuel-burning appliances checked.