I Believed These 7 ‘Facts’ About Carbon Monoxide. All of them were wrong.
My 4-year-old’s headache wasn’t a cold. It was the air in our house.
Last winter she said her head hurt for three weeks straight. We blamed it on the cold she’d been fighting. Then a friend who works for the gas company showed up with a meter, ran it through our house, and found something that changed everything I thought I knew about home safety.
I’m not a doctor. I’m not a scientist. I’m a dad of two who almost lost something I can’t get back.
Seven myths. All wrong. Here’s what’s actually true.
1.“If the alarm is silent, I’m fine.”
U.S. CO alarms are built to a standard called UL 2034. It’s designed to avoid alarming.
At 70 PPM your detector is allowed to wait up to 4 hours before sounding. Below 70 PPM, it can stay silent forever.
You can sit at 50 PPM for weeks. Chronic headaches. Brain fog. Fatigue. Real danger for kids and pregnant women. And your fully-functional alarm will not make a single sound.
It’s not broken. It’s working exactly as designed.
See the one I use →
2.“My smoke detector covers CO.”
Smoke detectors and CO detectors use completely different sensors. Smoke detects burnt particles. Carbon monoxide is an invisible gas that needs an electrochemical sensor.
Unless your device explicitly says “combination smoke + CO,” that disc on your ceiling is deaf to carbon monoxide. It will glow green while the room fills.
3.“It’s only a few years old. I’m fine.”
CO sensors die — usually after 5 to 10 years — and most of them die silently. The test button on your wall only checks the speaker and the battery. Not the sensor itself.
4.“I’d smell it.”
Carbon monoxide has no smell. None. Ever.
People confuse CO with natural gas, which utility companies deliberately spike with a rotten-egg odorant so leaks get noticed. CO gets no such courtesy from chemistry. It’s odorless, colorless, tasteless.
See the one with a screen →
5.“CO is a winter problem.”
Some of the deadliest CO events in America happen in late summer.
The CDC flags portable generators as the leading cause — after hurricanes, power outages, even a long camping weekend. A single generator can produce as much CO as hundreds of idling cars.
Add cars warming in attached garages, gas water heaters, pool heaters, charcoal grills near a window. CO season is every season.
See my year-round monitor →
6.“Mount it high. Gas rises.”
CO mixes evenly with air, top to bottom. The NFPA is explicit: mounting height doesn’t matter much.
What matters is coverage. The rule that actually saves lives: one detector on every floor, one outside every sleeping area.
7.“My doctor would catch it.”
CO poisoning mimics the flu. Headache, nausea, fatigue, brain fog. Wellness checkups don’t test for it. ER doctors miss it routinely because the symptoms are everyday and the test is uncommon.
Families have been treated for “flu that won’t go away” for months while CO hummed in their basement.
The only person who can catch low-level CO before it catches you is you — and only with a device that shows the actual number, not just a green light.
See mine on the nightstand →The only way to know what’s in your air is to see the actual number.
What I have on my wall now
Meet the AirGuard 4-in-1 Detector.
My buddy at the gas company found a cracked heat exchanger in our basement venting CO into our ductwork. We replaced the furnace that week. My daughter’s headache — the one I’d been blaming on a cold for three weeks — was gone by the third morning.
But it haunted me. So I went looking for a detector that does what those seven myths convinced me wasn’t possible: show me an actual number. I found this one. My buddy has the same one at his house. So does the fire captain.
- Live CO in PPM, from 0 — see the slow creep weeks before any alarm ever beeps.
- Catches natural gas and propane too — one device, three threats.
- Temperature + humidity on the same screen, so you’ll actually glance at it daily.
- 30-second install. Plugs into any US outlet. No tools, no electrician.
Up to 50% off
for a limited time only!
I was skeptical too. But with free US shipping and a 100-night money-back guarantee, there’s nothing to lose.
Try it risk-free →