The answer to 'why is my AC' is that there could be several common causes, such as a refrigerant leak, a problem with the compressor, or a clogged air filter. Symptoms may include the AC not cooling properly, strange noises, or the unit not turning on at all. Some solutions you can try yourself include changing the air filter, cleaning the outdoor unit, and checking the thermostat settings. However, for more complex issues, it's best to call a professional HVAC technician to diagnose and repair the problem properly.
Trying to DIY HVAC repairs can be dangerous if you don't have the right training and equipment. HVAC systems use high-voltage electricity and pressurized refrigerant, so attempting repairs yourself could lead to injury or further damage to the system. It's always safer to have a licensed and insured HVAC technician service your AC unit.