Smoke and CO Alarms

Alan Stephens • May 7, 2025

Two simple ways to protect your home and family.

Smoke and Carbon Monoxide Alarms – 2 Easy Ways to Protect Your Home and Family

 

One of the most common defects I encounter during a home inspection is the absence or inoperable condition of smoke and carbon monoxide alarms. These life-saving devices are designed to alert you to the presence of smoke or dangerous levels of carbon monoxide (CO) in the air, giving you and your family time to evacuate safely and, if necessary, alert emergency services. Today’s standards and available options for smoke and CO alarms in the home are relatively straightforward and economical, so protecting your home and family has never been easier. In this blog, we’ll review each type of device and its requirements.

 

Smoke Alarms and Detectors

 

Smoke alarms are especially crucial in preventing fire-related deaths and injuries. According to the National Fire Protection Association (NFPA), roughly three out of five home fire deaths occur in homes with no smoke alarms or non-functioning smoke alarms. This statistic is a grim reminder of the importance of having working smoke alarms in your home.

 

You should be aware that there is a difference between a smoke “alarm” and a smoke “detector”. A detector is a sensor that monitors for smoke and is connected to a fire alarm system. A smoke alarm has both a sensor AND a sound-emitting speaker that notifies the home occupants of the presence of smoke. Smoke alarms are the most common devices found in homes.

 

There are also different types of smoke alarms that are designed to respond to different types of fires. An “ionization” smoke alarm is generally more responsive to flaming fires, whereas a “photoelectric” smoke alarm is more responsive to smoking, smoldering fires. A dual-sensor alarm with both types of sensors offers the best protection and is generally recommended.

 

Today's standards for smoke alarms require at least one device per bedroom and one device on each floor. This includes basements and attics but excludes crawl spaces and unfinished storage areas. Smoke alarms should be installed in accordance with the manufacturer's instructions and should be placed on the ceiling or high on the wall (within 12” of the ceiling), as smoke rises.

 

Smoke alarms should be tested every 2 months to confirm that they are functional. They are powered either by batteries (replaceable or 10-year) or hardwired with battery backup. Replaceable batteries should be replaced at least annually.

 

According to the NFPA, when present, hardwired smoke alarms operated in 94 percent of the fires considered large enough to trigger a smoke alarm. Battery-powered alarms operated 82 percent of the time. Power source issues were the most common factors when smoke alarms failed to operate.

 

Smoke alarms should be replaced based on the date of manufacture on the back label – generally every 10- years.

 

Carbon Monoxide Alarms

 

Carbon monoxide (CO) is a colorless and odorless gas that’s produced when fossil fuel is incompletely burned because of insufficient oxygen. In a home, this is commonly related to space heaters, water heaters, blocked chimneys, or a running vehicle inside a garage.  It’s also a by-product of wood fires, charcoal grills, and malfunctioning heating systems. When inhaled in high concentrations, CO will deplete the available oxygen in a person’s blood, leading to disorientation, and in severe cases, permanent memory impairment or death.

 

The Centers for Disease Control and Prevention (CDC) reports, "Every year, at least 420 people die in the U.S. from accidental CO poisoning.” The CDC also goes on to say, “More than 100,000 people in the U.S. visit the emergency department each year due to accidental CO poisoning.” https://www.cdc.gov/nceh/features/copoisoning/index.html

 

When selecting a CO alarm, confirm that it is UL approved and loud enough to wake you up.

 

According to the 2005 edition of the carbon monoxide guidelines, NFPA 720, published by the National Fire Protection Association, sections 5.1.1.1 and 5.1.1.2, all CO alarms 'shall be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms,' and each alarm 'shall be located on the wall, ceiling or other location as specified in the installation instructions that accompany the unit.' Additionally, today’s standards require at least one alarm on each floor of the home, and in the proximity (within 20’) of any fuel-burning appliance (i.e., furnace or fireplace) and an attached garage.

 

The best place for a CO alarm is on a wall roughly five feet from the floor, where it can measure the air at a height that people in the house are breathing it. This ensures that any dangerous levels of carbon monoxide are detected quickly, allowing you to evacuate the area and call for professional help.

 

In addition, take the following measures:

• Make sure appliances are installed and operated according to the manufacturer’s instructions.

• Have the heating system, chimney, and vents inspected and serviced annually.

• Examine vents and chimneys regularly for improper connections, cracks, rust, or

stains.

• Make sure to read your CO alarm's user guide and keep it near your CO alarm

for quick reference.

 

Battery-operated CO alarms should have the battery replaced annually. Any CO alarm should generally be replaced every five to six years.

 

A combination smoke and carbon monoxide alarm is an alarm that has both sensors to sense smoke and to sense carbon monoxide. These alarms may look like smoke alarms and are mounted on the ceiling or the wall near the ceiling. Recommended replacement is every 7 years for a combination CO/smoke alarm.

 

A Home Maintenance Inspection is a great way to identify issues that potentially compromise the safety, longevity, and value of your home. Contact Acuity Home Inspections today to schedule!

By Alan Stephens December 3, 2025
A valuable tool for revealing hidden issues.
By Alan Stephens November 5, 2025
November is National Child Safety and Protection Month. Data shows that accidental injury is the leading cause of death in children less than 14 years old, with over 30% of those injuries occurring in the home. Some of the most common home-related injuries, and where they happen, include: Burns – in the kitchen or at the barbeque grill Suffocation – in an unsafe sleep environment, foods (i.e., hot dogs, grapes), small items (i.e., batteries, coins), and items that can strangle or entrap Drowning – in the bathroom, kitchen, swimming pools, or hot tubs Cuts – in the kitchen, garage, or garden shed Falls – on stairs, from high windows, or from tipping furniture Poisoning – under the kitchen sink, in the garage or garden shed, the bathroom medicine cabinet, or anywhere medicines are stored (such as a purse or car console) As much as a parent thinks that they’ll be able to always watch their young children closely, even with the best preparedness and intentions it only takes a few seconds for an inquisitive baby or toddler to put themselves in an unsafe situation. Accidents do happen, even when precautions are taken, so being prepared to react calmly and quickly can help minimize the severity of any injury. To provide a safe home environment and reduce the risk of injury to children (and grandchildren) it’s important to look for and address potential safety risks in all areas of the home – inside and out. For homes with infants and toddlers, try to look at the world from their perspective. Spend some time crawling around on your hands and knees and try to find anything that could cause an injury. If you have older children, you could even involve them in a challenge to help you find potential hazards with prizes or rewards for their input! The following checklists for each area of a home can help your awareness of potential hazards and options to prevent them: General: Keep an “emergency contact” list for your pediatricians, doctors, poison-control center, neighbors, and close relatives. While it’s relatively easy to find these on your cell phone, a printed list prominently located will be easily available to you or others who may be watching your children. Learn CPR (cardiopulmonary resuscitation) and the age-appropriate Heimlich maneuver. Purchase or assemble a first-aid kit with a supply of bandages, tape, gauze, antibiotic cream, antihistamines, and any specific emergency instructions someone might need. Confirm the placement of smoke and carbon monoxide detectors in the proper locations throughout the home and, depending on their type, change the batteries regularly. Have a working fire extinguisher available and make sure you know how to use it. Kitchen: Childproof latches that secure doors and drawers automatically when closed All knives, forks, scissors, and other sharp tools stored in a latched drawer Dishwasher lock to prevent opening and access to dangerous objects Oven-door lock and stove-knob protectors Anti-tip bracket installed on the range Locate chairs and stepstools away from the stove When stovetop cooking, use the back burners or turn pot handles away from kids’ reach Glass objects stored out of reach Countertop appliances and cords out of reach Garbage kept in a cabinet or other childproof location Under-sink cleaning supplies and other unsafe products in a childproof cabinet Plastic bags stored out of reach or in a childproof cabinet or closet Refrigerator magnets or other small items out of reach Working fire extinguisher located in a childproof but accessible location Tables free of tablecloths within a child’s reach Highchair equipped with a safety belt and strap between legs Child's Room/Bedroom: Safety belt on the baby's changing table Crib slats less than 2-3/8” apart Crib hardware secure and free from sharp edges Crib mattress properly sized (no gaps around edges) Crib free of a “drop-side” Crib free of pillows, bumper pads, stuffed animals Hanging mobiles with string or ribbons out of reach Cordless window treatments (or cords secured out of reach) Electric cords >3’ away from the crib Dresser equipped with an anti-tip device Non-locking toy chest with slam-proof lid All nightlights clear of bedspreads or curtains Flame-retardant sleepwear with no drawstrings Bathroom: Water heater set below 120°F Childproof latches on all drawers and cabinets Razors, scissors, and other sharp objects stored out of reach Medications, cosmetics, cleaners, nail polishes, and other toxic materials out of reach and stored in a childproof cabinet or drawer GFCI protection on all outlets Toilet-lid lock and always left closed when not in use Hair dryers, curling irons, and electric razors unplugged and stored securely when not in use Nonskid bottom of shower and bathtub Garage & Laundry Area: Tools and supplies used for cleaning, auto maintenance, pool care, gardening, and lawn work stored out of reach or in a secured location Garbage and recycling bins covered and secured Bleaches, detergents, and other cleaning products in their original containers and stored in a locked cabinet Laundry detergent pods out of reach and out of sight Clothes washer and dryer doors kept closed when not in use Walls & Floors: No peeling or cracking paint on walls No nails or other sharp or removable hardware within reach Mirrors and frames out of reach Doors & Windows: Doors equipped with finger-pinch guards One-piece door stops (or rubber tip removed) Doorknob covers on doors you don’t want your child to enter or exit Childproof locks on sliding doors Decals on glass doors Furniture located away from windows Safety guards on upper-story windows Window blinds and curtains free of cords or cords secured out of reach Furniture: Bookshelves and other furniture equipped with an anti-tip device Protective padding on corners of coffee tables Hand-me-down toys and equipment confirmed for no recalls TV’s mounted securely to the wall Childproof drawers with stops to prevent drawers from falling out, free of hazardous objects Stairways: Approved and mounted safety gates at the top and bottom of every stairway Stairs free of loose carpeting or objects Balusters on stairway guards with less than 4” spacing Railings and balusters secure Electrical: All unused outlets covered with safety plugs Cord holders to keep longer cords fastened to walls Extension cords not a tripping hazard and unplugged when not in use Heating & Cooling Elements: All radiators and baseboard heaters covered with childproof screens Gas fireplace valves and switches secured or out of reach Fireplace screen or barrier in place Electric space heaters >3’ from beds, curtains, or flammable materials Outdoors/Backyard/Pool: Walkways and outdoor stairways well lit Stairway risers closed to prevent entrapment or falls Sidewalks and walkways free of major heaving cracks or tripping hazards Swing sets free of sharp edges, rust, or splintering wood Swings, slides, and other equipment securely fastened Softened ground below swings (i.e., sand, mulch, rubber mats) to absorb the shock of a fall Min. 5’ climb-proof fencing surrounding the pool Pool access with a self-closing gate and childproof lock Alarm on door accessing pool from the house Ladders removed from above-ground pools when not in use Other Safety Issues: Checked, confirmed, and removed any poisonous houseplants No smoking rule to protect your kids from secondhand smoke Testing and required mitigation for radon, lead, asbestos, mold, and other air quality issues Guns kept in a locked cabinet, separate from the ammunition A Home Maintenance Inspection can help identify safety hazards in the home and provide a strategy for confirming a safe home environment for your family.
By Alan Stephens October 1, 2025
Tips for creating a healthier living space