I can guide you through a general process that HVAC professionals typically follow to diagnose AC issues:
Gathering Information: The technician will start by asking you questions about the AC problem you are experiencing. They'll want to know if the AC is not cooling, making strange noises, leaking, or showing any other issues.
Visual Inspection: The technician will visually inspect the AC unit, both inside and outside, to check for any obvious signs of damage or malfunctions.
Checking Thermostat: The thermostat is a common culprit for AC issues. The technician will verify if the thermostat settings are correct and test its functionality.
Electrical Components: The electrical connections, fuses, and circuit breakers will be checked to ensure there are no electrical issues affecting the AC.
Air Filter Inspection: A clogged or dirty air filter can hinder the airflow and affect the cooling performance. The technician will inspect and replace the air filter if necessary.
Refrigerant Levels: Improper refrigerant levels can lead to cooling problems. The technician will check the refrigerant levels and look for any leaks in the system.
Condenser and Evaporator Coils: Dirty coils can reduce the efficiency of the AC unit. The technician will inspect and clean the condenser and evaporator coils.
Checking for Leaks: If the AC is low on refrigerant, it might have a leak. The technician will use special tools to detect and fix any leaks in the system.
Compressor Inspection: The compressor is a crucial component that can fail or malfunction. The technician will inspect it for any issues.
Testing the System: After completing the inspection and necessary repairs, the technician will test the AC system to ensure it's functioning properly.
As for upfront estimates, HVAC companies may have different policies. Many reputable companies do provide upfront estimates, especially for standard services and common issues. However, in some cases where the problem is not apparent or requires extensive diagnosis, the technician may need to assess the system before providing an accurate estimate.
If you encounter AC problems, it's essential to contact a qualified HVAC professional to diagnose and repair the issue safely and efficiently.