TP-Link Tapo H100 and Sub-GHz Sensors Bring Smart Cellar Humidity Monitoring to Home Assistant

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A homeowner set up a TP-Link Tapo H100 smart hub with a T310 temperature and humidity sensor to monitor cellar conditions and prevent mould caused by condensation. The H100 communicates with its battery-powered sensors over 868 MHz sub-GHz radio, which penetrates concrete far more reliably than standard 2.4 GHz Wi-Fi, making it well suited for basement environments. Because TP-Link's native Home Assistant integration does not expose the H100's child sensors, the community-built Tapo Controller integration via HACS is required to bring the readings into the platform. Rather than relying on raw relative humidity figures, which can be misleading without temperature context, the author converts the two sensor readings into a dew-point value using the Magnus formula. This dew-point spread against the cellar's coldest surface temperature is used as the true trigger for condensation risk alerts, avoiding false alarms on ordinary humid days.

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