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Quick verdict
If you care about indoor air quality, this sensor covers temperature, humidity, and CO2 in one device with a clear LCD display. It works with Home Assistant over Bluetooth or Matter via a Hub. The CO2 readings are useful for automating ventilation. Trigger a fan when levels climb. Not the cheapest option if you only need temp and humidity, but the CO2 monitoring justifies the step up.
Standout: Combined temperature, humidity, and CO2 monitor with LCD display; reaches Home Assistant locally over Bluetooth, and gains Matter only when a SwitchBot hub bridges it.
Notes last checked May 31, 2026.
Compatibility snapshot
Home AssistantgoodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple HomeokayWorks, but with limits or extra setup.
Google HomeokayWorks, but with limits or extra setup.
AlexagoodWell supported, with only minor gaps.
Works offlineyes
Setupeasy
Extra hub neededno
Powerbattery
Local control facts
Home Assistant: switchbot integration, Local Push, Gold on the quality scale (home-assistant.io, checked Sep 10, 2026)
Why it stands out
three sensors in one: temperature, humidity, and CO2 monitoring
built-in LCD display shows readings without needing a phone or dashboard
Matter via Hub means data can flow into Home Assistant locally
Reasons to hesitate
CO2 sensor adds cost over basic temp/humidity sensors
Bluetooth range limits placement options without a Hub
Hub required for Matter and remote data access
Best for
indoor air quality monitoring with Home Assistant automations
anyone who wants a standalone display plus smart home integration
Avoid if
you only need temperature and humidity, since simpler sensors cost less
you want a fully local Thread or Zigbee sensor without any hub
Privacy and local-control notes
Environmental data stays local over Bluetooth. Hub bridges to WiFi for Matter and cloud features. No personal data collected.
Home Assistant support: supported · integration path: SwitchBot / Matter.
Buying reality check
Price notes: Mid-range pricing is fair for a three-in-one sensor with a display. Comparable to dedicated CO2 monitors that lack smart home integration.
Verified price reads: lowest seen $59.49, latest $59.49 on Sep 6, 2026.
CO2, PM2.5 and VOC with no cloud account: AirGradient ONE overall, Apollo AIR-1 for ESPHome, IKEA ALPSTUGA for the money. What each one actually measures.
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