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