Silent Until 70 PPM
Headaches and fatigue can already start — especially in kids — while a standard alarm says nothing.
21,537 homes protected
Protect your family from the silent killer
See the air your family breathes — live, from 0 PPM.
- ✓ Reads CO from 0 — old alarms wait for 70
- ✓ Plugs in anywhere in 30 seconds
- ✓ Live number = daily proof it works
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As featured in
AirGuard warns you first
It doesn’t wait until the air is dangerous. You see the number rise from zero — and act before a late alarm becomes the first sign of trouble.
The part nobody tells you
Your alarm is built to stay silent until it’s almost too late.
Not broken. Not old. Designed. Everything under 70 PPM is treated as nothing. That gap is why CO still sends 100,000+ Americans to the ER and kills 450+ every year, many with a “working” detector on the wall. The body doesn’t wait for 70:
30 PPMHeadache, fatigue, nausea
50 PPMPhysical stress increases
70 PPMMost alarms finally react
The AirGuard difference
What makes AirGuard earlier, smarter & safer.
Live From 0 PPM
AirGuard shows the exact number as CO begins to rise, long before symptoms.
Waits Up To 4 Hours
Even at 70 PPM, a standard alarm may wait hours before making a sound.
Instant Awareness
One glance at the screen tells you what’s in the air — without waiting for a siren.
No Proof It Works
A green light may keep glowing over a failed sensor, leaving owners unaware.
Proof It’s Alive, Daily
The live reading gives you visible proof the sensor is working every day.
Blind To Gas Leaks
CO-only detectors cannot detect natural gas or propane.
3 Gases, 1 Screen
CO, natural gas and propane are monitored together on one display.
Cries Wolf Over Dinner
Nuisance alarms can train families to ignore the beep or remove batteries.
No Cooking False Alarms
It reads gas levels, not smoke or steam, so ordinary cooking does not trigger it.
🔊 And yes — there’s a loud emergency siren built in
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Trusted nationwide
Why 21,537+ families trust AirGuard™.
1
Sees CO From 0 PPM
A live reading appears from the first trace — well before a standard alarm would make a sound.
2
Catches Gas & Propane Too
Three gas threats under one roof, watched on one screen. A CO-only alarm misses two of them.
3
30-Second Plug-In Install
Use any standard US outlet. No tools, ladder, electrician or batteries. CO mixes evenly with air, so outlet height works.
4
Temp & Humidity Built In
Useful daily readings make the detector something you naturally check instead of forget.
5
Proof It’s Working, Every Day
The live reading is daily proof that the sensor is active — no blind trust in a green light.
6
Affordable For Every Room
Bundle pricing makes it practical to cover every floor and sleeping area.
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Real families, real protection
Hear from families we’ve helped protect.
4.8★★★★★
21,537+ Homes
Protected
Caught It In Week One!
★★★★★
Tuesday morning I saw 23 PPM in the basement. My old alarm upstairs stayed quiet. The technician found a cracked heat exchanger in our nine-year-old furnace.
For My Dad
★★★★★
My dad is 78 and lives alone. I bought him a 2-pack and plugged them in myself. Every Sunday he reads me the number — zero every time.
Caught A Problem Early
★★★★★
It read 12 PPM in the laundry room three days after installation. The dryer vent had come loose behind the wall. There were no symptoms or beeps — just a useful number.
For Our New Baby
★★★★★
With a gas furnace and a baby on the way, we upgraded our detectors. The 4-pack was installed before dinner. Seeing zero outside the nursery helps me sleep.
Know what’s in the air your family breathes
Limited-time bundle savings available
Choose Your Protection:
2-Pack
/detector
total
What you get
- ✓ 2 AirGuard detectors
- ✓ 100-night trial + lifetime warranty
- ✕ Silent Killer Home Audit™ $47
- ✕ 10-Minute Family Emergency Plan $29
- ✕ Home Placement Map $19
4-Pack
/detector
total
The Full Protection Stack
- ✓ 4 AirGuard detectors
- ★ Silent Killer Home Audit™ $47
- ★ 10-Minute Family Emergency Plan $29
- ★ Home Placement Map $19
- ✓ 100-night trial + lifetime warranty + free US shipping
Total protection value today
Check the bundle variant title
8-Pack
/detector
total
What you get
- ✓ 8 AirGuard detectors
- ★ Silent Killer Home Audit™ ×2 $94
- ★ Emergency Plan + Placement Maps $48
- ✓ 100-night trial + lifetime warranty + free US shipping
Total protection value today
Check the bundle variant title
The Sleep Easy Guarantee
Try AirGuard in your home for 100 nights. If you don’t sleep easier knowing what’s in your family’s air, return it for a full refund — including return shipping.
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Frequently Asked Questions
Jessica from Tampa asks,How is this different from the detector I already own?⌄
A standard alarm may stay silent until CO reaches roughly 70 PPM, then wait before sounding. It only communicates “fine” or “emergency.” AirGuard displays the actual reading from 0 PPM, so you can see a problem developing and verify the sensor is active.
Next question is from Amy,Where do I put it? What height?⌄
Plug it into a standard wall outlet. Because CO mixes evenly with air, outlet height is suitable. Place one near each sleeping area, one near the main fuel-burning appliance and one on every floor. Avoid placing it directly beside a stove or inside a bathroom.
Ryan from Boston says,How many do I need?⌄
Use one per floor, one near every sleeping area and one close to the main gas appliance. A typical two-story home with a basement often needs four; many apartments can be covered with two.
Liz from Denver emails and says,Will it false-alarm when I cook?⌄
The sensor reads CO and combustible gas rather than smoke or steam, so ordinary cooking or a steamy shower should not trigger it. The live screen also shows whether a level is rising or falling.
Jenna asks,How do I know the sensor still works?⌄
A standard test button mainly confirms the speaker works. AirGuard’s live display gives ongoing visible feedback that the sensor is active.
Mark from Cleveland asks,What if it doesn’t work for me?⌄
Try it for 100 nights. If you are not satisfied, return it for a refund with return shipping covered. After the trial, each AirGuard is covered by a lifetime warranty.
Priya from Austin asks,Can I use it in a rental or RV?⌄
Yes. It plugs into a standard outlet without drilling or hardwiring. It is also suitable for RVs, campers and cabins where generators or propane heaters may create CO risk.
?Still have questions?⌄
Use the store’s live chat during business hours.
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Coverage guide
How many AirGuards should you have?
Place at least one on every floor and one outside each sleeping area. Many families add another near the garage or water heater, so a rising reading is always close enough to see.
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From the community
Real questions. Real people.
Featured community feedback
Is this legit or another one of those dropship gadgets? My feed keeps showing it and now my husband wants four of them.
We’ve had ours since March. It reads zero most days and rose to four when I ran a generator in the garage with the door cracked. That was enough for me to move the generator outside.
Okay, that’s actually helpful. Thank you.
Our basement unit read 9–11 PPM for two days. A furnace technician found a partially blocked flue. The older detector never chirped once.
How loud is the alarm if it goes off? Our bedrooms are upstairs.
I used the test button and it is loud — comparable to a smoke alarm. You should hear it upstairs.