What Does Your Furnace Have to Do With Carbon Monoxide?

CARBON MONOXIDE • HEATING SAFETY • MINNESOTA HOMES

Carbon monoxide deserves a different kind of HVAC conversation.

Not scary marketing.

Not:

NOT THE MESSAGE “Your old furnace is poisoning you.”

Just facts.

START HERE Carbon monoxide—CO—is a colorless, odorless gas that can be produced when fuels burn incompletely.

Fuel-burning heating equipment is one potential household source, which is why combustion, venting and working CO alarms all matter.

You Cannot Smell Carbon Monoxide

This is the distinction homeowners need to remember.

NATURAL GAS Added odorant

A possible gas leak may be noticed by a distinctive sulfur or rotten-egg-type odor.

VS.
CARBON MONOXIDE No smell

CO itself is colorless and odorless.

YOU CANNOT RELY ON YOUR NOSE That is why carbon-monoxide alarms are an important layer of household protection.

What Can Create a CO Problem?

Potential problems involving fuel-burning systems can include:

COMBUSTION Improper combustion
VENTING Venting problems
FLUES Blocked flues
EQUIPMENT Damaged equipment
AIR MOVEMENT Backdrafting
OTHER SOURCES Other combustion appliances
EQUIPMENT Fuel burns
→
VENTING Combustion products leave
→
WHOLE SYSTEM Both pieces matter
Heating safety is not only about the furnace or boiler itself. The combustion and venting system work together.

CO Alarms Are Backup Protection

A carbon-monoxide alarm is important.

It does not replace proper heating-system installation, maintenance or venting.

SAFE INSTALLATION Equipment installed correctly
+
MAINTENANCE Equipment receives routine attention
+
CO ALARMS Backup warning protection
U.S. EPA GUIDANCE CO alarms should be considered backup protection—not a replacement for proper installation, use and maintenance of fuel-burning appliances.

Source: U.S. Environmental Protection Agency

Minnesota Homes Are Required to Have CO Alarms

Minnesota law requires approved and operational carbon-monoxide alarms in covered residential dwellings.

MINNESOTA STATUTE § 299F.51
Within 10 feet

of each room lawfully used for sleeping in single-family dwellings and dwelling units in multifamily dwellings.

Follow the alarm manufacturer's instructions regarding:

PLACEMENT Where the device belongs
TESTING How to test the alarm
BATTERIES When batteries require attention
REPLACEMENT Device end-of-life guidance
State requirements establish where alarms are required. The manufacturer's directions still matter for the specific device installed in your home.

Source: Minnesota Revisor of Statutes — § 299F.51

Should Your Furnace Be Inspected?

Fuel-burning heating equipment deserves routine attention.

FURNACES Fuel-burning heating equipment
BOILERS Hydronic heating equipment
CHIMNEYS Combustion exhaust path
FLUES + VENTS Venting condition
CPSC RECOMMENDATION Yearly professional inspection of fuel-burning home heating systems—including furnaces, boilers, chimneys, flues and vents.

That does not mean every inspection uncovers a dangerous condition.

It means combustion equipment deserves routine attention.

Source: U.S. Consumer Product Safety Commission

What If the CO Alarm Goes Off?

Do not treat an active carbon-monoxide alarm like an annoying battery chirp.

ACTIVE CO ALARM
Do not try to find the source first.
01

Immediately move everyone outside to fresh air.

02

Call emergency services, your fire department or 911.

03

Account for everyone who was inside.

04

Do not reenter until emergency responders say it is safe.

DON'T SILENCE IT AND RESTART THE FURNACE If an appliance is identified as the source, do not operate it again until it has been properly serviced.

CO Symptoms Can Be Easy to Misread

Carbon-monoxide exposure can produce symptoms that may initially resemble other illnesses.

Headache
Dizziness
Nausea
Fatigue or weakness
Shortness of breath
Confusion at higher exposure
IF YOU SUSPECT CO EXPOSURE Prioritize people—not HVAC troubleshooting.

Move to fresh air and seek emergency or medical help as appropriate rather than staying inside to diagnose equipment.

CPSC notes that high-level exposure can progress rapidly and may cause confusion, loss of coordination, unconsciousness and death.

Source: U.S. Consumer Product Safety Commission — Carbon Monoxide Fact Sheet

Does an Old Furnace Automatically Produce CO in the Home?

SHORT ANSWER No.

Equipment age alone does not prove unsafe operation.

AGE Useful equipment context
≠
PROOF Automatic evidence of CO entering the home
THIS IS WHY TESTING AND INSPECTION MATTER Evaluate how the equipment and venting are actually operating instead of making fear-based assumptions from age alone.

Heating Safety Should Be Boring

The best outcome is not dramatic.

STEP 01 Heating system inspected
→
STEP 02 Venting operating correctly
→
STEP 03 CO alarms working
IDEAL WINTER RESULT Nothing dramatic happens.
AIR COMFORT'S GOAL We would much rather help keep heating safety boring.
PREPARING A FUEL-BURNING HEATING SYSTEM FOR WINTER?

Understand the Equipment Without the Fear-Based Sales Pitch

Air Comfort Heating & Air Conditioning helps homeowners throughout Anoka County, the North Metro and surrounding Minnesota communities inspect and service furnaces, boilers and other home comfort equipment before heavy heating season.

The goal is simple: understand what is operating normally, identify anything that needs attention and make sure the homeowner understands the next step.

FREQUENTLY ASKED QUESTIONS

Carbon Monoxide & Heating Questions

Can you smell carbon monoxide?

No. Carbon monoxide is colorless and odorless. A natural-gas odor and carbon monoxide are not the same thing, which is one reason working CO alarms are important.

Where does Minnesota require CO alarms?

Minnesota law requires an approved and operational carbon-monoxide alarm within ten feet of each room lawfully used for sleeping in single-family dwellings and dwelling units in multifamily dwellings.

Does a CO alarm replace furnace maintenance?

No. The U.S. Environmental Protection Agency describes carbon-monoxide alarms as backup protection rather than a replacement for proper installation, use and maintenance of fuel-burning appliances.

What should I do if my carbon-monoxide alarm sounds?

Do not ignore an active CO alarm or stay inside trying to find the source. Move everyone outside to fresh air, call emergency services or 911, account for everyone and do not reenter until emergency responders say it is safe.

Carbon Monoxide Safety References

Safety and legal information in this article is based on guidance from the U.S. Environmental Protection Agency, U.S. Consumer Product Safety Commission and Minnesota Revisor of Statutes.

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