1 6

The NorthAir Sentry

The NorthAir Sentry

Your home is leaking chemicals

See Them Live

Built in Alarm

No Apps, Wifi, or Subscriptions

60 Day Money Back Guarantee

Rated 4.8 by 1,148 customers

Details

The NorthAir Sentry is a household air quality screening monitor. It tracks
the three chemicals you can't see, smell or taste.

Formaldehyde, CO₂ and TVOCs

Plus temperature and humidity, on a single live screen.

No app. No WiFi. No subscription.

Guarantee

We offer a 60-Day Money Back Guarantee

If it doesn't show you something useful in the first 60 days, send it back. Full refund, no questions!

For more information click here!

Shipping

We strive to provide you with the best possible shopping experience, including fast and reliable shipping.

Estimate Shipping Timelines:
USA: 4-10
Canada: 4-10
United Kingdom: 3-5
Australia: 6-12
New Zealand: 6-12
Orders are typically processed within 1-3 business days.


Free Shipping
2 Year Warranty
View full details
Selected Variant Image
The NorthAir Sentry
$85.00 USD
$85.00 USD

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

60 Day Money Back Guarantee

Rated 4.8 By Thousands

 
 

3 Chemicals Leaking Into Your Home

  • ⚠️ HCHO

  • CO₂

  • VOCs

Formaldehyde

Leaks from new furniture, floors, and paint for up to a year after install. The WHO classifies it as a known human carcinogen.

Carbon Dioxide

Builds up in closed rooms while you sleep or work. Harvard found a 50% drop in cognitive function above 1,400 ppm.

Volatile Organic Compounds

The fumes from candles, cleaners, perfume, and air fresheners. Linked to chronic headaches, irritated eyes, and respiratory damage with long term exposure.

Easy Setup

One Sensor Per Reading

Most cheap "5 in 1" monitors only have one real sensor inside. They read VOCs, then estimate the other 4.

The Real Difference

  Others

60-Day Trial

Fake Numbers

Live Readings

Portable

Measures Formaldehyde

Measures Co2

What Our Customers Say About Us

4.8

Based on 1,148 Reviews

  • David K.
    Verified Buyer
    Bedroom hits 1,650 ppm CO2 by 3am with the door closed. Now we sleep with the door cracked and mornings are completely different.
  • Angela P.
    Verified Buyer
    Honestly didn't think this would do much. We moved into our 'new' house about 8 months ago and I've had a low grade headache and sore throat the entire time. Doctor said allergies. Three different filters did nothing.Plugged this in and the formaldehyde reading was orange in the bedroom for the first 4 days. Pulled out the dresser we bought from the previous owners and the number dropped within a week. I'm not sick anymore. Wish I'd found this 6 months ago.
  • Nicole F.
    Verified Buyer
    I'm 33 weeks pregnant and have been freaking out about the nursery. Painted the room, assembled the crib, got new carpet. Got this for peace of mind. The first week the formaldehyde reading was high enough to actually freak me out. Opened windows every day, ran a fan, took about 12 days to settle. My partner thought I was being paranoid until he saw the screen.
  • Kevin D.
    Verified Buyer
    New build, moved in 5 months ago with our 1 year old. Both my wife and I started feeling off, kid had a cough that wouldn't quit. Pediatrician shrugged. This thing showed the formaldehyde was high most of the time. Called the builder, turns out they used a cheaper subfloor than spec. They came back and dealt with it. Without the reading we'd have just kept living in it.
  • Chris G.
    Verified Buyer
    Repainted my toddler's room Saturday. The VOC reading told me she couldn't sleep in there until Tuesday. Glad I didn't guess.
  • Samantha T.
    Verified Buyer
    Tried air purifiers, allergy shots, fancy pillows for years. Turns out my bedroom CO2 was 1,800 every night. One star off because the humidity reading lags a bit but the main readings have been worth the money.
  • Ryan S.
    Verified Buyer
    New sofa, weird headaches when I sat on it. Confirmed the VOC was elevated for 3 weeks
  • Harry H.
    Verified Buyer
    Watched the CO2 climb from 600 to 1,400 with the door closed during a movie. Cracked a window, watched it fall. Does what a CO2 monitor should
  • Karen M.
    Verified Buyer
    We sleep with the dog and our two kids end up in our bed half the time. CO2 was hitting 2,100 by morning. Window cracked every night now and I wake up actually rested for the first time in years
  • Brad S.
    Verified Buyer
    Numbers actually move when they should. Up when I cook, way up when I light a candle. Was sure this would be junk. It's not.

Where should I put it?

Wherever you spend the most time. Bedroom for sleep, home office for work, nursery for the baby. You can move it around as needed.

How do I know it's actually accurate?

A lot of cheap "5 in 1" monitors run one sensor and estimate the other 4 readings. That's why their numbers drift when someone walks past with perfume. The NorthAir Sentry has a separate sensor for each of the 5 readings, so each number on screen is its own real measurement.

What do I do when a reading goes red?

Open a window for CO₂.
Move new furniture out for 2 weeks for formaldehyde.
Kill the candle or fragrance for VOCs.
We ship a quick reference card with every unit that tells you what each colour means and the next step to take.

I already own a HEPA purifier. Why do I need this?

A purifier cleans. A monitor measures. HEPA filters trap dust and pollen but they can't touch formaldehyde or CO₂, which are usually the bigger problem. The NorthAir Sentry shows you what your purifier is missing so you stop spending on the wrong fix.

Do I need WiFi or an app?

No. Just turn it on, easy as that. Everything you need is on the display. No app, no subscriptions.