Earlier this month, in Boston, MA, during an annual tune-up and maintenance session for a commercial client's HVAC system, I discovered a significant airflow blockage in a Carrier Infinity system. The blockage was caused by a heavily soiled filter and accumulation within the ducts. I replaced the old filter with a new HEPA filter and performed a thorough cleaning of the ducts. Additionally, I recalibrated the system's Honeywell programmable thermostat to ensure efficient operation. Post-maintenance testing confirmed the system is now running efficiently, with improved air quality and circulation.