Recommended by firefighters
Protect your family from the silent killer
A standard CO alarm stays silent until carbon monoxide hits 70 PPM — and can wait up to 4 hours before it makes a sound. AirGuard shows you the real number on a display, starting at 0. So you catch a problem while it’s still just a problem.
★★★★★
4.8 from 2,127 families
AirGuard is currently sold only on the Primo Goods website. We are the only authorized seller — if you see it anywhere else, it isn’t us.
Honestly the kind of review I never write. We’ve got a gas stove and water heater (built our place in 2018) and I’d never even thought about CO until our pediatrician mentioned it at my son’s checkup. Ordered the 4-pack on a Tuesday, plugged them in Thursday, and Sunday morning the one near the laundry room read 11 ppm. Called my brother who’s an HVAC guy — a bird had built a nest in the water heater flue. Eleven days. With two kids in the house. I’m not exaggerating, this thing might have saved us.
You can’t see it. You can’t smell it. And it doesn’t hurt.
Carbon monoxide leaks from furnaces, water heaters, stoves and garages. It puts a child to sleep before they ever feel a thing. And if your detector’s sensor has quietly died — the green light keeps glowing anyway.
Most families never knew there was a problem until it was too late.
Headaches, nausea, confusion — almost always mistaken for the flu first.
The green light keeps glowing over a dead sensor. Most people never know theirs stopped working.
Your alarm is built to stay silent until it’s almost too late.
Every standard CO alarm is built to one safety standard. Here’s what that standard actually allows it to do before it makes a single sound:
Headaches and fatigue can already start here — especially in kids, pregnant women, the elderly, and anyone who’s been asleep for hours. Your alarm? Says nothing.
Nausea, dizziness, confusion within a few hours. Already past the level OSHA allows in a workplace — and your alarm is still legally allowed to say nothing.
Severe headache, vomiting, impaired judgment. And your alarm can still legally wait up to four hours before it has to make a single sound.
Shows you the live number from zero, in real time. So you watch CO climb the moment it starts — not after the first headache hits.
By the time a normal alarm finally beeps, a sleeping child can already be past the point of walking to the door. AirGuard shows you the truth from zero.
The detector with a display.
Plug it in at eye level. See the number. Know you’re safe — or act fast if you’re not.
See danger from 0 PPM
A real-time number for CO, natural gas, humidity and temperature — not a yes/no light that only screams when it’s already bad.
4 sensors, 1 device
CO, natural gas, humidity and temperature in one unit. Most detectors only catch a single threat.
30-second install
No ladder. No tools. No electrician. Plug it into any US outlet and it’s working.
Proof it’s alive
The live number is your proof the sensor works — every day. No more green light glowing over a dead detector.
Real families. Real protection.
Worth it just for week one
Bought this after my brother-in-law's family had a scare. Week 1, Tuesday morning, I see 23 PPM in the basement. My $40 First Alert upstairs? Quiet as always. Cracked heat exchanger on a 9-year-old furnace. Just get the 4-pack. Don't mess around with this stuff.
For my dad
My dad is 78 and lives alone in Pittsburgh. Bought him the 2-pack and drove over to plug them in myself. Now when I call him Sundays the first thing I ask is what's the number say dad and he reads it to me. 0 every time. Silly little ritual but it makes me feel better.
Good, not great — being honest
Had this 2 months. The live PPM readout is genuinely useful and way easier to read than my old Kidde. Only gripe: the alarm is a bit quieter than my old one when you hit test — worth knowing if you have a big house. Build quality is fine, not premium. Would still buy again.
Caught a problem before it caught us
Reading 12 PPM in the laundry room three days after installing. Turned out the gas dryer vent had come loose behind the wall. No symptoms yet, no beeping alarm — just a number on a screen that told us something was wrong. Plumber said another week and we'd have been in the ER. Buy this.
Replaced all 3 of my old detectors
I had three Kidde plug-ins and didn't know if any of them actually worked. After reading about the 5–7 year sensor life thing I tossed all three and replaced with the 4-pack. Now I can glance at the screen every morning and know it's working. Worth every penny for the peace of mind.
For our new baby
We have a gas furnace and a baby on the way. My OB literally told us at our last appointment to upgrade our CO detectors. The 4-pack arrived in 2 days and my husband had them all plugged in before dinner. Knowing the number is 0 right outside the nursery lets me sleep.
- ✓ 2 AirGuard detectors
- ✓ Free US shipping
- ✓ 100-night money-back trial
- ✓ Lifetime warranty
- ✓ 4 AirGuard detectors
- ★ Free placement guide
- ✓ Free US shipping
- ✓ 100-night money-back trial
- ✓ Lifetime warranty
- ✓ 8 AirGuard detectors
- ★ Free placement guide
- ✓ Free US shipping
- ✓ 100-night money-back trial
- ✓ Lifetime warranty
At Primo Goods, we make sure our customers feel safer — or we refund 100% of their purchase. We’re so confident you’ll finally sleep knowing your family is protected that we’ll bear all the risk.
Got Questions? We got you covered!
How is this different from the detector I already own? +
Where do I put it? What height? +
How many do I need? +
Will it false-alarm when I cook? +
How do I know the sensor still works? +
What if it doesn’t work for me? +
Can I use it in a rental or RV? +
How do I contact support? +
Real humans, usually within the hour during business hours. Pick whatever’s easiest:
Real questions. Real people.
2,847 comments · sorted by Top
Can someone vouch for this? Saw the ad three times today and my wife is pregnant so I’m not taking any chances with our gas furnace. Is it actually legit or just another drop-ship detector?
@Marcus works awesome man. Ordered the 4-pack after my brother-in-law had a scare with his water heater. One per floor + one in the hallway outside the bedrooms. Reads 0 PPM consistently. Get the 4-pack — you’ll want one near the nursery.
Seconding Dan. Had mine 2 months. Quiet, no false alarms, and the digital readout is the reason I bought it over the beeper ones. Congrats on the baby
We have a gas stove and I’ve been paranoid ever since I read that study last year. My regular alarm has NEVER gone off but I don’t feel safe. Does this actually show the low levels you can’t smell?
Yep. Got one near our gas stove. Reads 2–6 PPM when the burners are going and drops back to 0 within 10 min of turning the hood on. Honestly kind of eye-opening. We run the hood every time now.
32 years retired from the fire service. Responded to more CO calls than I can count. The digital PPM readout is the right idea. Standard alarms only trigger above 70 PPM sustained. By then the damage is starting. Bought the 4-pack for my kids’ houses. Sleep better knowing it’s there.
HVAC tech here. Saw one of these in a customer’s basement last month, didn’t think much of it. Two days later it caught a back-drafting flue on a tankless water heater. Now I recommend them on every gas appliance job.
Anyone with the 8-pack got a placement diagram for a 2-story + basement? Where do you put #5 through 8
genuine question, is this just a CO detector with a screen? what’s the point of the screen if it still alarms at the same level
screen shows the live PPM. lets you see if something’s slowly building before it hits the alarm threshold. mine showed 8 ppm one morning, traced to a gas fireplace pilot. fixed it before anyone got sick. that’s the point
Ordered the 4-pack after my friend’s son got hospitalized from CO last winter. They had a Kidde from 2019 that never went off. Doctor said it was probably below the alarm trigger for hours.
Got this for my mom in Florida. She’s 73, lives alone, gas stove. Now she calls me Sunday mornings to tell me “the number is still zero, Tommy.” Worth every penny just for that.
RV owner here. Two of these in our rig. Generator vent issue on a trip last fall — AirGuard at the back was reading 15–20 ppm while we slept. Built-in CO alarm never made a sound. Killed the genny, opened up, everyone was fine. This thing saved us.
Furnace tech, 18 years in. The 5–7 year sensor life on standard CO detectors is real and most people have no idea. Tested 12 detectors in customer homes last month, 4 were dead. Owners had no clue.
I’m 68 and the big green number is the reason I bought it. Can read it from across the room even without my glasses. Whoever designed this with seniors in mind, thank you.
How is this not on Amazon? Kinda sus
Hey Daniel — we sell direct to keep prices honest and ensure every unit ships from the latest production batch. Amazon resellers often unload aged inventory and the CO sensor degrades on the shelf. We’re the only authorized seller.
The live readout literally caught a problem last week. 19 ppm on the one near the mudroom. Realized I’d left the car idling in the attached garage longer than I thought. A regular detector wouldn’t have made a sound. This one showed me a problem I created.
Showing 3 of 2,847 · 94% of commenters recommend AirGuard
If you burn anything, this is for you.
Parents
Peace of mind in every room your kids sleep in.
Gas-heat homes
Furnace, water heater or stove? You have a CO source.
Aging parents
A number they can read to you over the phone.
Renters
Plugs in, no install, comes with you when you move.
RVs & cabins
Generator and propane risk, wherever you are.
Know what’s in the air your family breathes.
See the number. Every day, in every room that matters.
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