Fire & Safety Systems
Carbon Monoxide Detectors: The Silent Threat in Your Home
Updated April 2026 | By Berkley Security Inc. | 7 min read
Critical Safety Information:
Carbon monoxide (CO) kills over 400 Americans annually and sends 50,000+ to emergency rooms. It is colorless, odorless, and tasteless. Every home with gas appliances, a fireplace, or an attached garage needs professionally monitored CO detectors. Place detectors on every level of your home and near all sleeping areas. Test monthly, replace every 5-7 years.
Carbon monoxide is produced by any fuel-burning appliance: gas furnaces, water heaters, stoves, fireplaces, generators, and vehicles. When these devices malfunction or operate in poorly ventilated spaces, CO accumulates to dangerous levels. The threat is insidious because you cannot see, smell, or taste the gas. Symptoms mimic common illnesses, causing victims to fall asleep rather than evacuate.
How Carbon Monoxide Detectors Work
Modern CO detectors use electrochemical sensors that react to CO molecules in the air. When CO concentration reaches dangerous thresholds, the alarm triggers:
CO Alarm Thresholds (UL 2034 Standard)
70 PPM
Alarm within 60-240 minutes
Headache, fatigue after hours
150 PPM
Alarm within 10-50 minutes
Confusion, nausea developing
400 PPM
Alarm within 4-15 minutes
Life-threatening in 1-2 hours
Where to Place CO Detectors
CO placement is different from smoke detector placement. CO mixes evenly with air (it is roughly the same density), so height matters less than proximity to sources and sleeping areas:
- Every level of your home. Minimum one detector per floor, including the basement. CO can accumulate on any level.
- Near sleeping areas. Install within 15 feet of every bedroom door. CO must be detected before occupants lose consciousness.
- Near gas appliances. Install 15-20 feet from furnaces, water heaters, and gas stoves. Closer than 5 feet may cause nuisance alarms during normal operation.
- Attached garage wall. Place on the interior wall adjacent to an attached garage. Vehicle exhaust is a leading source of residential CO.
Common Placement Mistakes
- Inside the garage. Exhaust fumes cause constant false alarms. Place on the home-side wall instead.
- In dead-air zones. Avoid corners where walls meet ceilings with no airflow. CO will not reach the sensor quickly enough.
- Near windows or vents. Fresh air dilutes CO readings and delays detection.
Monitored vs Standalone CO Detectors
| Feature | Standalone | Professionally Monitored |
|---|---|---|
| Local Alarm | Yes | Yes |
| Emergency Dispatch | No (must call 911) | Yes (automatic) |
| Works When Away | No one to hear alarm | Monitoring center responds |
| Incapacitated Occupants | No help dispatched | Help dispatched automatically |
| Cost | $25-$50 per detector | Included in $25-$50/month plan |
| Maintenance | Self-managed | Professional service visits |
Common CO Sources in Mississippi Homes
- Gas furnaces. Cracked heat exchangers leak CO into ductwork and living spaces. Annual HVAC inspection catches this before it becomes dangerous.
- Gas water heaters. Backdrafting occurs when exhaust cannot vent properly, pushing CO into the home instead of outside.
- Attached garages. Running a car even briefly in a closed garage produces lethal CO levels. Modern cars produce less CO but still enough to kill in enclosed spaces.
- Portable generators. After hurricanes and storms, generators cause a spike in CO deaths. Never run a generator inside, in a garage, or within 20 feet of open windows.
- Fireplaces. Blocked or dirty chimneys trap combustion gases including CO inside the home.
CO Detection in Flowood, MS
Families across Flowood, Brandon, Jackson, and the metro area trust Berkley Security for professionally monitored CO detection. Our background-checked technicians ensure correct placement, integrate CO alerts into your existing alarm panel, and include CO monitoring as part of your comprehensive home safety system.
Protect Your Family from CO Poisoning
Professionally monitored CO detection with automatic emergency dispatch. Free safety assessment for your home.
Schedule a Safety AssessmentFrequently Asked Questions
Where should CO detectors be placed?
On every level, within 15 feet of sleeping areas, and 15-20 feet from gas appliances. At breathing height (5 feet) or on the ceiling. A 2-story home with gas heat needs a minimum of 3 detectors.
What are CO poisoning symptoms?
Early: headache, dizziness, nausea, fatigue (flu-like). Advanced: confusion, chest pain, loss of consciousness. Key difference from flu: everyone in the building is affected simultaneously and symptoms improve when leaving the building.
How often should CO detectors be replaced?
Every 5-7 years (check expiration date on back). Test monthly. Replace batteries annually, or use sealed 10-year lithium models. The electrochemical sensor degrades and loses sensitivity over time.
Monitored vs standalone CO detectors?
Monitored detectors dispatch emergency services automatically, even if you are away or incapacitated. Standalone only sounds a local alarm. Monitored is critical because CO can knock you unconscious before you can call 911.
What causes CO in a house?
Gas furnaces, water heaters, stoves, fireplaces with blocked chimneys, vehicles in attached garages, and portable generators. In Mississippi, furnaces and water heaters are the most common sources.
Do Not Leave Your Family Unprotected
Professionally monitored CO detection with automatic emergency dispatch. Since 1978.