HVAC diagnostics service 4

https://bravo-wiki.win/index.php/When_Your_Heating_Fails:_A_Guide_to_Emergency_Furnace_Repair

When my AC started making a weird grinding noise last summer, I called for an HVAC diagnostics service. The technician came out with a multimeter and a thermal camera, checking everything from the compressor amperage to the refrigerant pressure and airflow across the evaporator coil. He found a failing capacitor and a small refrigerant leak in under an hour. It was surprisingly thorough and saved me from a full system replacement.