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Is the SONOFF AirGuard CO2 worth it?

The SONOFF AirGuard CO2 ($45-$55) is recommended with a 8.4/10 consensus score across 7 expert reviews. Experts highlight matter-over-wifi works with apple home, google, alexa, and smartthings and ndir co2 sensor at a $50 price point — cheapest true co2 monitor. The Smart Cave says: "SONOFF's Matter implementation is genuinely cross-platform — set it up once and ..." Best for: Cross-platform smart homes, CO2 monitoring on a budget, Matter early adopters.

SONOFF AirGuard CO2 — Recommended per expert consensus
Recommended7 Expert Reviews
Price Range
$45-$55
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SONOFF AirGuard CO2

NM
Nicholas Miles · Editor-in-Chief & Methodology Owner

Sensors

SHE ScoreAbove Average

SmartHomeExplorer proprietary rating

6.9/10

7 expert sources

Compatibility Breadth5/10
Setup Ease5.7/10
Reliability6.4/10
Value Rating9.9/10
Future-Proofing7.5/10

The SONOFF AirGuard CO2 earns a SHE Score of 6.9/10, driven by strong value (9.9/10) with room to improve in compatibility breadth (5/10). Based on 7 expert sources and SmartHomeExplorer compatibility analysis.

How we calculate the SHE Score →

Expert Consensus: 8.4/10 across 7 sources

Updated today
“SONOFF's Matter implementation is genuinely cross-platform — set it up once and it works everywhere.”
— The Smart Cave

Key Features

  • ✓ Matter
  • ✓ NDIR CO2
  • ✓ PM2.5
  • ✓ Cross-Platform
  • ✓ $50 Value

Best For

Cross-platform smart homesCO2 monitoring on a budgetMatter early adopters

What Experts Agree On

What Experts Love

  • ✓ Matter-over-WiFi works with Apple Home, Google, Alexa, and SmartThings
  • ✓ NDIR CO2 sensor at a $50 price point — cheapest true CO2 monitor
  • ✓ PM2.5 and PM10 tracking alongside CO2
  • ✓ 3.6-inch display showing all readings at a glance
  • ✓ No subscription required

Common Criticisms

  • ✗ No radon or VOC detection
  • ✗ eWeLink app less polished than competitors
  • ✗ USB-C powered only, no battery option
  • ✗ Matter may require firmware update for full compatibility

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What The Experts Say

TH
“SONOFF's Matter implementation is genuinely cross-platform — set it up once and it works everywhere.”
The Smart Cave

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$45-$55 · 7 expert sources · 8.4/10 consensus

Featured in these buying guides

See how the SONOFF AirGuard CO2 ranks against the full field in our Sensors buying guides.

Frequently Asked Questions

Is the SONOFF AirGuard CO2 worth it?

The SONOFF AirGuard CO2 earns a 8.4/10 consensus score across 7 expert sources and is rated "Recommended". At $45-$55, it is best for Cross-platform smart homes. The Smart Cave notes: "SONOFF's Matter implementation is genuinely cross-platform — set it up once and it works everywhere."

How much does the SONOFF AirGuard CO2 cost?

The SONOFF AirGuard CO2 is priced at $45-$55. With a 8.4/10 score from 7 expert reviews and a "Recommended" rating, that price represents fair value relative to the ~7.5/10 average for Sensors products. Prices shift often, so check the live figure before buying.

Who is the SONOFF AirGuard CO2 best for?

The SONOFF AirGuard CO2 is best for Cross-platform smart homes, CO2 monitoring on a budget, Matter early adopters. Experts rate it "Recommended" with a 8.4/10 consensus across 7 sources.

How does the SONOFF AirGuard CO2 compare to other Sensors options?

Among the Sensors products we have aggregated, the SONOFF AirGuard CO2 ranks above average with a 8.4/10 score. See our full category comparison for head-to-head details.

What smart home systems does the SONOFF AirGuard CO2 work with?

The SONOFF AirGuard CO2 works with Amazon Alexa, Samsung SmartThings, Matter. Check the compatibility notes above for any hub dependencies or setup requirements before you buy.

Does the SONOFF AirGuard CO2 need a hub or a subscription?

No mandatory subscription — the core features work without a monthly fee.

What are the best alternatives to the SONOFF AirGuard CO2?

If the SONOFF AirGuard CO2 ($45-$55, 8.4/10) is not the right fit, the closest alternatives in Sensors are Airthings View Plus, Qingping Air Quality Monitor Gen 2. Compare them on price, ecosystem support, and expert consensus to find your match.

What are the pros and cons of the SONOFF AirGuard CO2?

The main strengths of the SONOFF AirGuard CO2 are matter-over-wifi works with apple home, google, alexa, and smartthings and ndir co2 sensor at a $50 price point — cheapest true co2 monitor. The most-cited downside is no radon or voc detection. Overall, 7 expert sources rate it "Recommended" with a 8.4/10 consensus score.

Sources & Methodology

This review aggregates 1 independent expert review into a single consensus score. See how we build consensus scores and the SHE Score methodology.

Expert review sources cited on this page:

  • The Smart Cave

Affiliate disclosure: SmartHomeExplorer.com participates in the Amazon Associates program. We earn a commission from qualifying purchases at no extra cost to you. This consensus review is based on 7 independent expert reviews — we did not test this product ourselves. Always verify current prices and availability before purchasing.

Independence notice: Smart Home Explorer is an independent publication. SONOFF and other product names, logos, and brands referenced on this page are the property of their respective owners and are used for identification purposes only. This review is not sponsored by, affiliated with, or endorsed by SONOFF or any other manufacturer named in this article.