Why is my air conditioner not cooling properly and how can I fix it if the issue is a frozen evaporator coil?

Your air conditioner may not be cooling properly because the evaporator coil is frozen. This can happen due to restricted airflow or low refrigerant levels. To fix it, you can turn off the AC to let the coil thaw, check and clean the air filter, and ensure proper airflow around the unit. If the issue persists, you may need to call a professional to recharge the refrigerant or address any other underlying problems.