Carbon Monoxide Safety: What Every Homeowner Must Know

Carbon monoxide (CO) is called the "silent killer" because it's colorless and odorless. Understanding CO risks and prevention is essential for every homeowner with fuel-burning appliances.

Sources of Carbon Monoxide

HVAC-Related Sources:

Gas furnaces

Gas water heaters

Gas fireplaces

Boilers

Other Sources:

Attached garage vehicles

Generators

Gas stoves

Charcoal grills (never use indoors)

How CO Poisoning Occurs

When fuel-burning appliances malfunction or aren't properly vented, they can produce excess carbon monoxide. Common causes include:

Cracked heat exchangers

Blocked flues or chimneys

Backdrafting from negative pressure

Improper installation

Lack of maintenance

Warning Signs

Symptoms of CO Exposure:

Headache

Dizziness

Nausea

Confusion

Weakness

Chest pain

Important: These symptoms often resemble flu. If multiple family members experience symptoms that improve when leaving home, suspect CO poisoning.

Protection Strategies

Install CO Detectors:

Every level of your home

Near sleeping areas

Test monthly, replace batteries annually

Replace detectors every 5-7 years

Maintain Your Furnace:

Annual professional inspection

Heat exchanger inspection for cracks

Proper venting verification

Clean burners and components

Ensure Proper Ventilation:

Never block vents or flues

Keep exhaust pipes clear

Maintain proper drafting

If Your CO Detector Alarms

1. Don't ignore it—take it seriously

2. Get everyone outside immediately

3. Call 911 from outside

4. Don't re-enter until emergency services clear the home

5. Have your furnace inspected before using again

Bay Area Considerations

Our mild climate means furnaces may sit idle for months, then run heavily during cold snaps. This pattern can:

Mask developing problems

Allow blockages to form in unused flues

Cause seals to dry out

Annual pre-season inspections are especially important in our climate.

Carbon monoxide safety requires vigilance, but simple steps protect your family. Never skip furnace maintenance, and ensure working CO detectors are in place.