The answer to 'best AC repair' is to hire a licensed, professional HVAC technician. They have the expertise and specialized tools to properly diagnose and fix any issues with your air conditioning system. A professional HVAC technician can also provide preventative maintenance to extend the life of your AC unit and ensure it's running efficiently.
When choosing an HVAC contractor, look for one that is licensed, insured, and has experience working on your specific make and model of AC unit. They should also offer a warranty on their work. Getting multiple quotes can help you find the best value for the repair or service needed.