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The original was posted on /r/homeassistant by /u/Rude-News-8416 on 2026-06-11 16:40:25+00:00.
If you rely on home automation for critical tasks like climate control, a single offline sensor can create a precarious situation. Imagine your bedroom heater stays on for hours because your nightstand temperature sensor ran out of battery and went unavailable, leaving your automation blind. Your room becomes a sauna, and you do not realize it until you wake up sweating.
The common way to fix this involves building complex automations loaded with conditions to check if sensors are online. These grow unwieldy, hard to maintain, and a nightmare to debug when things go wrong.
The Sensor Failover blueprint offers a better path.
It wraps your primary sensor and a pool of backups into a single, reliable entity. If your trusted primary sensor goes offline, the blueprint instantly falls back to an average of any backups currently reporting. You can even apply weights if some sensors are more accurate than others.
Your downstream automations never see the underlying connection issues. They simply read one unbreakable sensor that stays online even when the individual parts are acting up.
I've been working on simplifying this in my own setup and think I've come up with a simple and repeatable solution. I've posted the full details, setup instructions, and the import link on the Home Assistant community forum:
https://community.home-assistant.io/t/stop-freezing-in-the-dark-build-unbreakable-sensors-with-the-failover-blueprint/1013598