Future‑proof the thermostat you love

As of October 25, 2025, Nest Thermostats of the 1st and 2nd generation are no longer supported by Google. Nest and Google Home app access have stopped working.

Sett is an open-source, enclosure-compatible version of the 2nd gen Nest thermostat. It reuses the enclosure, encoder ring, display, and mounts of the Nest but replaces the "thinking" part with open-source PCBs that interact with Home Assistant and other local-first home automation setups.

Subscribe to support the project and get blog posts about development progress, or order your Sett Thermostat below.

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Sett Open-Source Home Thermostat

$147.00 USD
$147.00 USD
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Blog and Current Progress

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  • The Last Day of Nest 2nd Gen Support

    The Last Day of Nest 2nd Gen Support

    Oct 25 - Today is the final day that Google will allow users of the 2nd gen Nest thermostat to use the Nest and Google Home apps with their thermostat. 

    The Last Day of Nest 2nd Gen Support

    Oct 25 - Today is the final day that Google will allow users of the 2nd gen Nest thermostat to use the Nest and Google Home apps with their thermostat. 

  • Should the Sett Thermostat switch to an e-ink screen?

    Should the Sett Thermostat switch to an e-ink s...

    What if the Sett thermostat used an e-ink display instead of its color LCD? We explore this question, diving into the appeal of e-ink’s calm, paper-like aesthetic for a device...

    Should the Sett Thermostat switch to an e-ink s...

    What if the Sett thermostat used an e-ink display instead of its color LCD? We explore this question, diving into the appeal of e-ink’s calm, paper-like aesthetic for a device...

  • Reverse-Engineering the LCD Display Interface of the Nest 2nd Gen Thermostat

    Reverse-Engineering the LCD Display Interface o...

    I reverse-engineered the Nest 2nd‑gen thermostat’s circular 320×320 LCD (TM025ZDZ01), built a 41‑pin 0.3 mm FPC breakout, and drove it over 3‑wire 9‑bit SPI with an ESP32‑C6 using Toit—covering the initialization...

    Reverse-Engineering the LCD Display Interface o...

    I reverse-engineered the Nest 2nd‑gen thermostat’s circular 320×320 LCD (TM025ZDZ01), built a 41‑pin 0.3 mm FPC breakout, and drove it over 3‑wire 9‑bit SPI with an ESP32‑C6 using Toit—covering the initialization...

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