A Google Nest thermostat typically requires replacement every 10 to 15 years, provided it is installed correctly with a dedicated C-wire. While the internal solid-state electronics and sensors are engineered for long-term residential use, aging lithium-ion backup batteries, degraded internal power-stealing capacitors, and outdated Wi-Fi chipsets eventually necessitate hardware upgrades over time. Verification: Monitor the device for chronic battery charging errors, Wi-Fi connectivity dropouts, or uncalibrated temperature readings that indicate hardware wear.
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