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Service Type: Demand Service Technician Summary: Upon arrival, the client reported that the living room thermostat was displaying a temperature reading noticeably lower than the actual room temperature. The client had placed three independent temperature sensors adjacent to the thermostat, all showing a discrepancy of approximately 5°F above the thermostat reading. To verify the issue, I used my own calibrated temperature sensors and placed them directly on top of the thermostat. The results confirmed the client’s observation, showing a consistent 5°F difference. A supervisor arrived on site to assist with diagnostics. Together, we conducted multiple tests on both HVAC units. We verified the full cooling sequence of operations for each unit and confirmed that both systems are operating according to the manufacturer’s specifications. To resolve the issue, we replaced the Ecobee thermostat. Before departing, I rechecked the temperature readings. The new thermostat’s reading aligned c