Best smart radon and co detectors for Home Assistant

If you’re building a local-first smart home with Home Assistant at the core, you’ll want to ensure your environmental sensors are as reliable and integrated as your other smart devices. Radon and carbon monoxide (CO) detectors are essential for safety, but they often lack the smart features you expect from modern home automation. This guide will walk you through the best options for detecting radon and CO, with a focus on compatibility with Home Assistant, and some notes on integration with HomeKit and Hubitat where relevant.

Radon Detectors That Work with Home Assistant

Radon is a colorless, odorless gas that can pose serious health risks if left undetected. While there are many traditional radon detectors on the market, few offer the smart integration you’d expect from a modern home automation setup. The key is to find a detector that either supports local integration or can be paired with a smart hub that works with Home Assistant.

The AirGradient One is one of the few radon detectors that offers real-time data and integration with Home Assistant. It connects via Wi-Fi and provides detailed air quality metrics, including radon levels. While it doesn’t support Z-Wave or Zigbee, it can be integrated through MQTT or a custom integration in Home Assistant. If you’re looking for a more affordable option, the AirGradient Open Air is a good alternative. It’s a simpler device that still provides radon readings and can be integrated using the same methods as the One.

For those who prefer a local-first approach, the Apollo Air 1 is a great choice. It’s a compact, battery-powered device that can be integrated via MQTT or a local API. It doesn’t have the same level of detail as the AirGradient models, but it’s reliable and easy to set up. If you’re using a smart hub like the Hubitat Elevation C8, you can also use the Apollo MSR-2 for more advanced monitoring. This device supports both Z-Wave and Zigbee and can be integrated with Home Assistant through a local MQTT broker.

CO Detectors with Smart Integration

Carbon monoxide is another silent killer, and having a reliable CO detector is crucial for any home. Most traditional CO detectors don’t offer smart integration, but there are a few that do. The frient Smart Plug Mini is a good example. It’s a compact, battery-powered device that can be integrated with Home Assistant via MQTT. It provides real-time CO readings and can trigger alerts through your smart home system.

If you’re looking for a tougher solution, the Heiman CO Alarm is a solid choice. It’s a Z-Wave device that can be integrated with Home Assistant through a Z-Wave hub like the ConBee III or Z-Wave Me RAZberry 7 Pro. It offers both local and remote monitoring and can be paired with other smart devices for a more comprehensive safety system. The Heiman Z-Wave Siren is another option if you want a siren that can be triggered by the CO alarm for added security.

For those using HomeKit, the First Alert Z-Wave Smoke is a good option, though it’s primarily a smoke detector. However, it can be used in conjunction with a CO detector for a more complete safety setup. If you’re using Hubitat, the Konnected Alarm Panel Pro is a powerful option that supports both Z-Wave and Zigbee and can be integrated with Home Assistant through MQTT.

Tradeoffs and Recommendations

When choosing a smart radon or CO detector, there are several tradeoffs to consider. First, integration with Home Assistant is critical. While some devices offer direct integration, others require additional steps like MQTT or custom integrations. This can be a barrier for users who are not familiar with setting up these systems.

Second, battery life and power requirements are important factors. Devices like the Apollo Air 1 and AirGradient Open Air are battery-powered and require minimal maintenance, making them ideal for local-first setups. However, they may not offer the same level of detail as their Wi-Fi-connected counterparts.

Third, the level of detail provided by the device matters. The AirGradient One offers more detailed data, including temperature and humidity, which can be useful for understanding the overall indoor environment. However, it’s more expensive than the Open Air model.

Lastly, the choice of smart hub or gateway can influence your options. If you’re using a Z-Wave hub like the ConBee III, you’ll have more options for integrating devices like the Heiman CO Alarm and Apollo MSR-2. If you’re using Zigbee, the Z-Wave Me RAZberry 7 Pro is a good choice for a hybrid setup.

Quick Verdict

If you’re looking for a reliable, smart radon and CO detector that integrates well with Home Assistant, the AirGradient One and Apollo Air 1 are excellent choices. For CO detection, the Frient Smart Plug Mini and Heiman CO Alarm are strong options. Each has its own tradeoffs, so choose based on your specific needs and integration preferences. Always ensure that your devices are compatible with your chosen smart hub and that they offer the level of detail and reliability you need for a safe, smart home.