Forensic AC Diagnostics.

When your air conditioner fails during an Illinois heat wave, the last thing you need is a technician who guesses. At Aurora HVAC Services, every AC repair begins with a systematic, data-driven diagnostic protocol. We measure voltage under load, compressor amperage draw, and capacitor microfarad ratings before we ever touch the refrigerant circuit.

The Science of Refrigerant Analysis.

Most companies will check if the system is "low on Freon" and simply add more. This is not a repair; it is a band-aid that violates EPA regulations. If your system is low on refrigerant, it has a leak. Period. Our protocol involves connecting digital Bluetooth manifold gauges to calculate precise Subcooling and Superheat values. Subcooling tells us the condition of the outdoor condenser coil and metering device. Superheat tells us the condition of the indoor evaporator coil and airflow. These two measurements, combined with ambient temperature data, provide a complete diagnostic picture of the refrigerant circuit's health. Only then can we identify the root cause—whether it's a restricted metering device, a dirty evaporator coil starving the system, or a genuine copper fracture requiring brazing.

Electrical Fault Isolation.

A significant percentage of AC failures are electrical, not refrigerant-related. The run capacitor is the single most common point of failure. It stores electrical energy and provides the phase shift necessary to start the compressor and condenser fan motors. Over time, especially during extreme Illinois summers, the dielectric fluid inside the capacitor degrades, reducing its microfarad rating. We test capacitors under load with calibrated meters, measuring the actual microfarad output against the rated value. A capacitor rated at 45µF that tests at 38µF is failing and will strand you without cooling within weeks. We also test contactor points for pitting, wire terminals for heat damage, and the compressor itself for ground faults and open windings.

Airflow: The Overlooked Variable.

High Total External Static Pressure (TESP) caused by undersized or collapsed ductwork is a silent killer. It forces the blower motor to work harder, generating excess heat that destroys the motor bearings, while simultaneously restricting airflow over the evaporator coil—causing it to freeze solid. We measure static pressure on every repair call using a digital manometer. If the reading exceeds the manufacturer's specification (typically 0.5" WC), we investigate the duct system for restrictions, crushed flex runs, or undersized return plenums.