An AC repair service typically includes diagnosing and troubleshooting issues with air conditioning systems, and making repairs or replacements as needed. This may include fixing or replacing parts such as compressors, condensers, evaporator coils, and ducts. It may also involve servicing or cleaning the system to improve its efficiency and longevity. Additionally, an AC repair service provider may offer maintenance or inspection services to prevent future issues and prolong the life of the system.