A residential thermostat typically requires replacement every 10 to 15 years for modern digital and smart touchscreen models, while traditional electromechanical thermostats can last up to 20 years. Over time, internal electronic microprocessors degrade, lithium-ion backup batteries fail, Wi-Fi radios become obsolete, and uncalibrated temperature sensors drift beyond acceptable comfort margins. Upgrading ensures accurate temperature control and modern smart efficiency. Verification: Compare ambient room temperature against display readings to check for sensor calibration drift.
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