Yes, digital and smart thermostats do go bad over time, typically exhibiting an average operational lifespan of 10 to 15 years. Over years of continuous operation, internal microprocessors degrade, solder joints experience thermal stress, lithium-ion backup batteries fail, Wi-Fi network chips become obsolete, and uncalibrated temperature sensors drift far beyond acceptable room comfort margins. Verification: Compare ambient room temperature using a separate thermometer against the thermostat display reading to check for sensor calibration drift.
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