A Google Nest thermostat typically has an expected operational lifespan of 10 to 15 years, combining solid-state microcontrollers, internal lithium-ion backup batteries, and digital relay switches. While traditional electromechanical thermostats can last indefinitely, smart thermostats manage internal Wi-Fi radios and power-stealing circuitry that can gradually degrade over time. Proper installation using a dedicated C-wire ensures stable power delivery and maximizes long-term device durability. Verification: Monitor the device for battery charging errors, Wi-Fi dropouts, or unresponsive display interfaces that indicate aging internal hardware.
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