"Honestly the best money I’ve spent on our home. The live number is right there every morning — real peace of mind. I’m already on my second one, sent it to my parents."
Protect your family from the silent killer.
Standard CO alarms stay silent until 70 PPM. AirGuard shows the live number from zero.
100-Night Money-Back Guarantee
If AirGuard isn't right for your home, return it within 100 nights for a full refund — no questions asked.
Will it false-alarm when I cook?
No — it shows a number instead of shrieking. Cooking may nudge the reading up a few PPM; you watch it settle back to zero, so you see what's happening instead of being startled by a blaring alarm.
How does it work & is it accurate?
AirGuard uses a lab-grade electrochemical CO sensor that reads continuously from 0 PPM, plus separate sensors for natural gas, humidity and temperature. Plug it into any outlet and the live number on the display updates in real time — that moving number is also your daily proof the sensor is working.
How is this different from the detector I already own?
Your current alarm stays silent until ~70 PPM and gives no honest warning when its sensor dies. AirGuard shows a live number from 0 PPM, and the moving reading is daily proof the sensor still works.
How many do I need?
One per level of your home, plus one near each sleeping area. Most homes are fully covered by the 4-Pack.
What if it doesn't work for me?
You're covered by the 100-night money-back guarantee plus a lifetime warranty — return it any time in the first 100 nights for a full refund.
"Honestly the best money I’ve spent on our home. The live number is right there every morning — real peace of mind. I’m already on my second one, sent it to my parents."
Your family's safety shouldn't be a guess. It should be a number.
A number on the wall you can actually read — so you're informed every single day, not just in an emergency.
A live number, from 0 PPM
See exactly how much carbon monoxide is in the air in real time — not a yes/no light that waits until it's already dangerous.
Four sensors, one device
Carbon monoxide, natural gas, humidity and temperature — all on a single display.
Plugs in, in 30 seconds
Into any standard US outlet. No wiring, no drilling, no electrician.
Proof it's working
The live number is daily confirmation the sensor is alive — never a green light glowing over a dead detector.
Carbon monoxide isn't rare. It's just silent.
It sends over 100,000 Americans to the ER every year — and most never saw it coming, because there was nothing to see.
Every one of them had a home, a furnace or a car — and thought it wouldn't happen to them.
As the gas climbs, every second counts. One of these waits hours.
The exact same carbon monoxide leak — with a standard alarm, and with AirGuard.
Headaches, fatigue and nausea begin.
Past the OSHA workplace safety limit.
After up to 4 hours of exposure.
You have no idea it's broken.
Safe — the display reads "0".
First warning — time to act.
Before symptoms even start.
You acted an hour ago.
Smarter than a cheap alarm. Cheaper than a "smart" one.
Everything you need to catch CO early — without the $150 price tag or the app.
Cheap CO Detector
Smart Detector*As low as $42/detector in the 8-pack. **Typical price of a leading Wi-Fi smart CO/smoke detector. Comparison vs. common $20 plug-in CO alarms, 2026.
Real families. Real protection.
4.8 from 2,127 verified buyers
"Plugged the 4-pack in on a Thursday. By Sunday the one near the laundry was reading 11 — turned out a bird had nested in the water heater vent. Really glad I had it."
"Easy to set up, screen is clear, does what it should. No complaints."
"Works well and the number is easy to read, which was the main thing for me. Knocking a star because the test button is a bit stiff."
"Saw 23 in the basement the first week. My old alarm upstairs never made a peep. Furnace guy found a cracked heat exchanger. Don't ignore this stuff."
"We cook a lot and I figured it'd go off constantly. It doesn't — it ticks up a little and comes right back down. Honestly reassuring."
"Got one for my mom who lives alone. She set it up herself with no trouble, which says a lot."
"live in an rv. plugged it in, been running two months, no issues. catches the generator if i leave it on too long."
"Does the job and the display is nice. Two stars off because the alarm when I tested it is REALLY loud and the cord is short, so it's awkward in my hallway outlet. Fine product, just wish those were better."
"First cold snap the furnace ran all night and it just sat at 0. Slept fine knowing that."
"Set one up for my dad — he can read it without his glasses. That was the whole point."
"Good detector, clear screen. Shipping was slower than I expected, but the product itself is solid."
"Power went out in a storm and it stayed on, which is exactly when you'd want it to."
"Really happy with it overall. Only thing — I wish it came in black, it's pretty visible against my wall."
"Old house, old gas lines. I glance at it most mornings out of habit now. Cheap insurance."
"Okay so I'm an anxious person and I used to lie awake wondering if the old one even worked since it never did anything. This one I can just look and see it's fine, and weirdly that's helped a lot. Sorry, long review lol."
"Bonus I didn't expect — it shows humidity too, and my basement runs damp. Handy."
"A neighbor had a scare so we finally got around to it. Took maybe five minutes for all four. Should've done it sooner."
"71 years old and I set it up in under a minute. No app, no phone nonsense, big clear number. Perfect for me."
"Works great. Saw it climb a bit one night with the gas heater on and cracked a window. Only complaint is the screen light is a touch dim in a dark room."
"Had a wifi one before that always wanted app updates. This just runs on its own. Prefer it."
"Minus 20 here and the furnace never stops in winter. Nice to glance over and see 0."
"It's fine. Does what it says. Mine took a couple days longer to ship than the site said and the box was beat up, though the unit was okay. Wouldn't say wow, but no regrets."
"We host a lot and run the oven hard around the holidays. It nudges up a touch and settles, never a false freak-out. Like that."
"Solid. Clear display, loud alarm (maybe too loud honestly). Would prefer something slimmer but it's a non-issue."
"What sold me: the old one could've been dead for years and I'd never know. This one I can actually tell it's on and working."
"Ran a generator after a storm and kept an eye on this from across the room. Did its job."
"About two months in. No drama, reads 0, easy. Exactly what I wanted from a detector."
"bought one to try, ended up getting a few more for the rest of the house. works, so why not."
"Replaced two ancient ones that were probably dead. Easy swap. Wish the cord were a little longer for my setup, but that's it."
"Does exactly what it's supposed to. Plugged in, reads 0, loud test. Happy."
"New baby, so we got serious about this. One in the nursery, reads 0 every night. That's all I need it to do."
"No fuss. Plug, read, done. Should've had one years ago."
Questions, answered.
How is this different from the detector I already own?
Your current alarm is a yes/no buzzer that stays silent until CO reaches ~70 PPM, with no honest warning when its sensor fails. AirGuard shows a live number from 0 PPM, monitors four threats, and the constantly-updating reading is daily proof the sensor is alive.
Does it sound an alarm, or just show a number?
Both. The live number gives you early warning so you can act before levels ever get dangerous — and AirGuard also sounds a loud 80+ dB alarm once CO crosses the danger thresholds, so it will wake you even at 3am. The display lets you act early; the alarm is your backstop.
Where do I put it? What height?
Any standard US outlet. CO mixes evenly with air, so outlet height works perfectly. Place one per level and within 10–15 ft of sleeping areas, near (not directly above) fuel-burning appliances. A free placement guide is included.
What happens if the power goes out?
You're still protected. AirGuard plugs into any standard outlet, and a built-in 9V battery backup keeps it running through a power outage — exactly when CO risk is highest, since that's when people reach for portable generators and space heaters.
How long does AirGuard last? When do I replace it?
The electrochemical CO sensor is rated for 3–5 years. Unlike a standard alarm that can quietly die without telling you, AirGuard's live number is daily proof it's still working — so you're never guessing whether it's time to replace it.
How many do I need?
One per level of your home, plus one near each sleeping area. Most homes are fully covered by the 4-Pack.
What if it doesn't work for me?
You're covered by the 100-Night Sleep-Easy Guarantee — return it within 100 nights for a full refund, no questions asked. Every unit also carries a lifetime warranty.
Can I use it in a rental or RV?
Yes. It plugs into any standard US outlet — no drilling, no wiring, no landlord approval needed. Ideal for rentals, RVs and cabins.