As a first-time home buyer, there are probably a few things that didn’t make the housewarming gift list—and smoke and carbon monoxide detectors was likely among them. They blend into the background so well that it’s easy to forget that they’re there. But when you really need them, they matter more than almost anything in your home. That’s why it’s so important you have the right ones, check that they’re functioning properly, and placed strategically throughout your home. Let’s take a look at the crucial info you need to know keep your home and your family safe.
Types of Smoke Detectors
There are two main types of smoke detectors—they each work in different ways and detect a different type of fire.
Ionization smoke detectors are particularly effective at sensing fast-moving, flaming fires. They use a small amount of ionizing material to monitor the air inside the sensing chamber. When smoke particles enter the chamber, they disrupt the ionization process, triggering the alarm. Fast-flaming fires can spread quickly, so early detection by ionization detectors is vital.
Photoelectric smoke detectors are better at detecting slow, smoldering fires. These detectors use a light source and a light-sensitive sensor. When smoke enters the chamber, it scatters the light beam, causing it to hit the sensor and trigger the alarm. Slow, smoldering fires may not produce flames initially, but they generate significant smoke, making photoelectric detectors a foundational component of your home’s safety.
Which should you choose?
Ideally, both. Using a mix of both types of detectors throughout your home gives you the broadest protection against all types of fires. Consider placing photoelectric detectors near bathrooms and kitchens, as they are less likely to trigger false alarms from steam or cooking smoke.
Types of Carbon Monoxide Detectors
Carbon monoxide (CO) is invisible and odorless, which is why a reliable detector is essential. These are the three carbon monixide detector types.
Electrochemical sensors are considered the most accurate and are the go-to choice for most homeowners. They use chemical solutions and platinum electrodes to trigger an electrical current when carbon monoxide is present.
Biomimetic sensors react the same way that your blood reacts to carbon monoxide. The gel in the sensor absorbs carbon monoxide, and changes color until the alarm sounds.
Metal oxide semiconductors heating element detects the presence of carbon monoxide, which triggers the alarm. They tend to be the best option for hard-wired installation.
What to look for
Whichever type you choose, make sure to check that it’s certified to the UL 2034 safety standard. This will ensure that you hear the alert long before carbon monoxide reaches dangerously high levels.
Placement Tips for Alarms
Where you put your smoke and carbon monoxide detectors is as just as important as which one you choose.
- Install detectors on every level of the home, including basements and attics, and near sleeping areas.
- Avoid placing detectors near windows, doors, or vents where drafts might interfere with their operation.
- On peaked ceilings, install detectors within 3 feet of the peak, but not in the apex itself.
- Keep detectors at least 10 feet away from cooking appliances to limit false alarms.
Detector Configurations
Smoke and carbon monoxide detectors come in three main power configurations:
Sealed 10-year battery detectors are the most low-maintainance option. These units eliminate the need for annual battery changes and typically require a replacement after a decade of use.
Battery-operated detectors are easy to install anywhere. They require regular battery changes (at least once a year) and to monthly testing.
Hardwired detectors connect to your home’s electrical system and typically have a battery backup. Many of these detectors are interconnected, meaning if one alarm sounds, all alarms in the house will activate. This feature is especially useful in larger homes.
Understanding What the Beeps Mean
Detectors make different chirping sounds depending on whether there’s an emergency and maintenance needed.
Emergency Alerts
Smoke detector: 3 loud, continuous beeps—evacuate immediately and call 9-1-1.
Carbon monoxide detector: 4 loud, continuous beeps—get outside to fresh air and cal 9-1-1.
Maintenance Alerts
1 chirp every 30–60 seconds: battery is low; replace battery.
2 chirps every 30–60 seconds: unit is nearing end of life (common after 7 to 10 years); replace it.
3 chirps every 30–60 seconds: possible sensor malfunction; clean unit and if the chirping persists, replace it.
All-In-One Devices
If you want to eliminate multiple devices throughout your home, consider getting a combination smoke and carbon monoxide detector, which offer a dual-sensor technology. Look for units certified to both UL 217 (smoke) and UL 2034 (CO) standards.
Keep Them Working Well
- Test monthly by pressing the test button on all smoke and CO detectors. If the alarm doesn’t sound, replace the batteries or the entire unit.
- Change batteries annually. An easy reminder is to do this when you adjust your clocks for daylight saving time.
- Clean monthly with vacuum or a microfiber cloth to remove dust to keep them clean and functioning correctly. Compressed air can also help with cleaning stubborn buildup. Avoid using chemicals. Avoid using chemical sprays.
- Replace units every 10 years, even if they seem to be working fine.
An Important Note About Kids and Alarms
Young children may not always wake up to a standard-tone alarm. Some advanced detectors now offer voice-alert options that allow you to customize recordings that can call your child by name.