SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard
SENTRY by CasaGuard

4.8/5

(1,422+ reviews)

SENTRY by CasaGuard

Rated #1 Home Gas Detector by American Families — 30-Day Risk-Free Trial
  • Detects CO, gas & propane instantly
  • 85dB alarm wakes the whole house
  • Live display, real-time readings
  • Plug in and protect in 30 seconds
  • 30-day money-back guarantee
Ships by tomorrow
FREE Shipping to USA
WARNING: Low Stock Notice
Most reorders come from customers buying a second unit for a parent, partner, or second home — once you see the number on the screen, you want it in every room that matters. Stock runs low fast for that reason. Order today — ships within 48 hours.
Money Back Guarantee

30-Day Money Back Guarantee

That's how confident we are in your results. But if you're not thrilled, send it back and we'll refund your purchase.

Olivia K. – New York, USA

I had no idea my furnace was leaking CO for two days. Couldn't smell a thing. This device is a must for every home.

SENTRY by CasaGuard
Excellent 4.9 | 1,422

SENTRY by CasaGuard

Get It By
Get It By

Went off at 2am — real gas leak


We had no idea there was a leak from our stove. The alarm woke the whole house up. Called the gas company and they confirmed it. This device is not optional anymore — it's essential

M
Marcus A. Verified customer

Finally a detector that actually works

I've had cheap CO detectors for years and never trusted them. The Sentry has a live display so I can actually see what's in my air at all times. That alone is worth every penny.

J
Janet L. Verified customer

Setup took less than a minute

Plugged it in, display lit up, done. No app, no pairing, no instructions needed. Works exactly as described and gives me real peace of mind every single night.

D
Derek C. Verified customer

Got one for every floor

Started with one for the kitchen, ordered two more after a week. The fact that it detects four different gases — not just one — is what sold me. Other brands don't do that.

M
Marit K. Verified customer

Best home safety purchase I've made

My husband is a skeptic about everything. Even he said this was worth it after seeing the live readings on the display. Solid build, loud alarm, does exactly what it promises.

D
Diane D. Verified customer

Your Home Has An Invisible Enemy. CasaGuard Finds It First.

Carbon monoxide and natural gas have no color, no smell, and no warning signs — until it's too late. Standard smoke detectors can't catch them. CasaGuard was built specifically to detect the gases your other alarms miss, the moment they appear in your air.

  • Detects Natural Gas and CO simultaneously
  • Early-level triggering - alerts before your family ever experiences symptoms
  • Always-on protection — no sleep mode, no downtime, no gap in your coverage

Frequently Asked Questions

What gases does CasaGuard detect? +


CasaGuard detects carbon monoxide (CO), natural gas (methane), propane, and other combustible gases. These are the four most common household gases responsible for accidental poisonings and house explosions. Most standard alarms only detect one.

How loud is the alarm? +


The alarm reaches 85 decibels — loud enough to wake a deep sleeper from across the house. You will never miss a warning, even in the middle of the night when it matters most.

Does it need batteries? +


No. CasaGuard plugs directly into any standard wall outlet and draws power continuously. There are no batteries to replace and no risk of a dead battery leaving your family unprotected.

Where should I place it in my home? +


Place CasaGuard near gas appliances like your stove, furnace, water heater, or dryer. For CO detection, one on each floor of your home — especially near sleeping areas — gives you maximum whole-home coverage.

How fast does it detect a leak? +

CasaGuard's sensor responds in under 10 seconds when gas is present at detectable levels. Early detection is what gives your family the time they need to evacuate safely before symptoms set in.

Is there a money-back guarantee? +


Yes. Every CasaGuard comes with a 30-day money-back guarantee. If you're not completely satisfied — for any reason — we'll refund your full purchase price. No questions asked, no hoops to jump through.