Every fall, the same few misconceptions about carbon monoxide come up, and they are usually the reason a detector that needed attention got ignored instead. Worth clearing these up before your furnace fires up for the season.

Myth 1: You Would Smell It Coming

Carbon monoxide has no smell, no color, and no taste. That is precisely why it is dangerous, and it is the entire reason a detector exists in the first place. Your senses give you no warning at all, no matter how much is in the air.

Myth 2: A New Furnace Cannot Leak Carbon Monoxide

Age increases the odds of a heat exchanger crack, but it does not eliminate the risk on newer equipment. A newer furnace can still develop a problem, particularly if something was installed incorrectly or after the system sat unused all summer.

Myth 3: If the Indicator Light Is On, the Battery Is Fine

An indicator light generally tells you the unit has power, not that the alarm circuitry itself will actually sound when it matters. Pressing the real test button confirms far more than glancing at a light ever will.

Myth 4: A Smoke Detector Covers You for Carbon Monoxide Too

Smoke detectors and carbon monoxide detectors sense entirely different things, smoke particles versus a specific gas, and a smoke detector’s sensor cannot detect carbon monoxide at all. Combination units exist and do handle both, but a standalone smoke detector alone leaves that risk fully uncovered.

Myth 5: If Nothing Has Happened Yet, Nothing Is Wrong

A slow leak from a hairline crack or a loosening connection does not automatically become obvious the first week it starts. The absence of a problem so far is not the same as the absence of risk, the risk simply has not caught up yet.

Why These Myths Matter Most Right Now

Once a furnace has sat unused all summer, that first run of the season is exactly when a small issue that developed quietly is most likely to turn into an active one.

Serving the Denver Metro

We help homeowners separate carbon monoxide fact from fiction, and check for the real thing, across Denver, Aurora, Lakewood, Westminster, Thornton, Centennial, Broomfield, Parker, Highlands Ranch, Commerce City, Littleton, Wheat Ridge, Brighton, Englewood, Arvada, Golden, Castle Rock, Greenwood Village, and Northglenn.

Frequently Asked Questions

What does carbon monoxide actually smell like? Nothing. It is completely odorless, which is why relying on smell to notice it is not a safe strategy under any circumstance.

Can carbon monoxide detectors expire? Yes, the sensor inside has a limited lifespan, typically five to ten years depending on the model, even if the unit still has working batteries.

Is a combination smoke and carbon monoxide detector as reliable as two separate units? Generally yes, as long as it is tested regularly and both sensors are within their rated lifespan.

Can a furnace produce carbon monoxide without any smell or visible sign? Yes. That is the core danger, a furnace can appear to be heating your home normally while a cracked heat exchanger or gas connection issue lets carbon monoxide into the air.

What is the fastest way to confirm my detector actually works? Press the test button and listen for a loud, clear alarm within a few seconds. If it does not sound right away, treat that as a unit needing new batteries or replacement.

Do Not Wait Until December to Find Out

If it has been a while, get it looked at before you are relying on it in December.

Book a fall safety check this week