Detecting a refrigerant leak in your AC involves looking for specific signs such as hissing or bubbling noises near the refrigerant line, which indicate escaping gas. Another common symptom is reduced cooling efficiency; your AC may struggle to maintain the set temperature or take longer to cool the space. You might also notice the system running continuously without reaching the desired temperature, leading to higher energy bills. Additionally, ice buildup on the refrigerant line or evaporator coils suggests low refrigerant levels. If you suspect a refrigerant leak, it’s crucial to contact a professional technician. They will use specialized equipment to locate and repair the leak, followed by recharging the system with the correct amount of refrigerant to restore optimal performance.