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We protect you when you can’t see the danger.
Carbon monoxide is invisible and odorless. AirGuard shows you the exact CO level from 0 PPM – updated every second – long before an old alarm makes a sound.
Protect My Family
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Lifetime Guarantee
Free Shipping
Lifetime Guarantee
5,000+ 5-Star Reviews
2026 Home Inspector Award
The silent threat
Your detector only has a green light.
The danger doesn’t.
A green light tells you nothing about what you are breathing tonight. AirGuard shows you the real number.
0PPM
AirGuard shows the CO level from zero – so you see a problem while it is still small.
70PPM
Old detectors stay silent until this level – often after hours of exposure.
1SEC
Live display updated every second. Detects CO and natural gas in one device.
AirGuard
Old
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Real-time control
Know the danger – before it’s too late.
Old detectors — stay silent until 70 PPM
AirGuard — shows the level from 0 PPM
CO + natural gas — one device, complete coverage
How it works
Protected in one second.
1
Plug it in
Plug AirGuard into any standard wall outlet. That’s the entire installation.
2
See the real number
The digital display shows the live CO level in PPM and natural gas presence – every second.
3
Act early
Get alerted at the first sign of danger – not at 70 PPM after hours of exposure.
★★★★★
“We thought our home was safe. Then we tested it. CO levels were dangerously high — invisible, odorless, and already in our kids’ rooms. Not anymore.”
— Sandra W. Verified★★★★★
First night: 41 PPM.
“Three days after installing it near the furnace, the display showed 41 PPM at 11 PM. Our previous detector had a green light and made no sound.”
MR
Michael R., OhioVerified Buyer
★★★★★
74 years old. Did it myself.
“I plugged it in without calling anyone for help. It took less time than making my morning coffee. I look at the zeros every day.”
EW
Eleanor W., VirginiaVerified Buyer
★★★★★
22 years in HVAC.
“I’ve seen what slow leaks do to families who trusted their green lights. This is what I installed in my own house.”
FD
Frank D., TennesseeVerified Buyer
Questions
Good to know.
Does AirGuard replace my existing CO alarm?
No. AirGuard is a supplemental monitor designed to work alongside your primary UL-listed CO alarm. Your primary alarm is there for emergencies – AirGuard lets you see the actual CO and gas levels in real time, from 0 PPM, every day.
How many units does my home need?
One per critical area: near your primary heat source, in the kitchen, in or outside sleeping areas and wherever your family spends a lot of time. The 4 Pack covers the critical areas of most family homes.
Will it alarm when I’m cooking?
The sensor is calibrated to distinguish normal cooking activity from genuine CO or gas accumulation, so it alerts you to actual danger – not to steam or humidity.
How long does it take to arrive?
All orders ship within 24 hours of purchase. Standard delivery is 3–5 business days across the continental United States. Shipping is free.
Protect your family tonight.
The air in your home is the same whether the detector alarms or not. The only question is whether you can see what’s in it.
Get My AirGuard
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AirGuard is a supplemental air monitor intended for use alongside a UL-listed CO alarm, not as a replacement for one. If you suspect a carbon monoxide leak, leave the home immediately and call emergency services.