Carbon Monoxide
7 myths about CO that put your family at risk
The “facts” most parents believe about carbon monoxide — and what’s actually true.
Read more →SALE: GET UP TO 50% OFF!
AirGuard is the #1 Best Seller in CO Alarms on Facebook
See the air your family actually breathes.
As featured in
The #1 must-have 4-in-1 air monitor
Most detectors only scream once it’s already an emergency. AirGuard shows you the real number — live, from zero — so you can act while a problem is still just a problem. One device watching the air your family actually breathes.
See CO From 0 PPM
A live number on a screen — not a yes/no light that only sounds once it’s already dangerous. Watch the level the moment it starts to rise.
4 Sensors, One Device
Carbon monoxide, natural gas, humidity and temperature — all on one screen. Most detectors only catch a single threat.
30-Second Install
Plugs into any US outlet. No ladder, no tools, no electrician, no dead batteries in the night.
Get Protected Today! →
Try it risk-free with our 100-Night Guarantee
Meet AirGuard
The detector with a display.
Plug it in, glance at the number, and know at a glance that your family is safe — or act fast if they’re not.
- Live CO reading from 0 PPM, updated in real time
- Catches natural gas and propane, not just CO
- The live number is your daily proof the sensor works
Makers of the AirGuard 4-in-1 Detector
A brand families trust.
We don’t just sell detectors — we give parents the one thing a green light never could: the truth about the air in their home.
Built for American homes
Calibrated for US outlets and homes — designed for the way American families actually live.
Developed with safety experts
Shaped alongside firefighters and HVAC pros who’ve seen what a silent alarm costs.
Serving families like yours
50,000+ homes now see the real number every day — not a light that hopes for the best.
Real families, real protection
Rated 4.8 by 2,127 families
★★★★★
Caught a problem in week one
Tuesday morning I saw 23 PPM in the basement. My old alarm upstairs? Silent as always. Cracked heat exchanger on a 9-year-old furnace. Don’t wait on this.
MD
Marcus D.
✓ Verified · Des Moines, IA
★★★★★
For my dad
He’s 78 and lives alone. Now when I call on Sundays the first thing I ask is “what’s the number, Dad?” and he reads it to me. Zero every time. Worth it just for that.
SK
Sarah K.
✓ Verified · Pittsburgh, PA
★★★★★
For our new baby
Gas furnace and a baby on the way. My OB told us to upgrade our CO detectors. Knowing the number is 0 right outside the nursery lets me sleep.
ER
Emma R.
✓ Verified · Denver, CO
100-Night Guarantee
Not sleeping easier? Send it back for a full refund — we cover return shipping.
Quality Assured
Professional-grade electrochemical sensing, tested to strict CO detection standards.
Fast, Free Shipping
Free US shipping on every order — most arrive in as little as 3 days.
Secure Checkout
Simple, encrypted checkout — a smooth, worry-free path to protecting your home.
Questions
Good to know
How is this different from the detector I already own? +
A standard alarm stays silent until CO hits around 70 PPM — and can legally wait up to 4 hours before sounding. AirGuard shows the live number from 0, so you see a problem building while it’s still just a problem.
How many do I need? +
One per floor, plus one near every sleeping area and one near your main gas appliance. A typical 2-story home with a basement needs about four; apartments often do fine with two.
Will it false-alarm when I cook? +
No. It reads carbon monoxide and gas — not smoke or steam — so searing a steak or a steamy shower won’t set it off.
What if it doesn’t work for me? +
Try it for 100 nights. If you’re not completely happy, send it back for a full refund — we cover return shipping. Every AirGuard is also covered by a lifetime warranty.
The Air Safety Guide
Learn what your alarm won’t tell you
Home Safety
Where to place a CO detector in every home
One per floor, one outside every bedroom — here’s the layout that actually keeps you safe.
Read more →
Carbon Monoxide
Why CO isn’t just a winter problem
Generators, garages and water heaters make carbon monoxide a year-round risk.
Read more →