The answer to 'AC not working' is that there are several common causes, including a faulty thermostat, clogged air filters, refrigerant leaks, and issues with the compressor or condenser unit. Symptoms may include the AC not turning on, warm air blowing, or the system short-cycling.
For minor issues, homeowners can try simple DIY troubleshooting like checking the thermostat, replacing air filters, and clearing debris around the outdoor unit. However, for more complex problems or if the system is not cooling properly, it's best to call a professional HVAC technician to diagnose and repair the issue. They have the expertise and tools to properly identify and fix the problem to restore your home's comfort.