HVAC systems work hardest during extreme heat and cold throughout the year. One of the most common causes of cooling problems is restricted airflow. A clogged filter, blocked return or closed vents can make an AC work harder and cool less effectively. If the system is running but the air feels warm, AC repair may involve refrigerant issues, coil problems or a failing component such as a capacitor or contactor. A professional HVAC visit typically includes checking refrigerant charge, measuring temperature split, inspecting coils, testing electrical components and confirming safe operation. Routine tune-ups are useful even when the system seems fine. Cleaning the outdoor unit, checking drainage, tightening electrical connections and confirming thermostat settings can help prevent mid-season failures. The best choice depends on the home, the condition of existing equipment and the goals for comfort and energy use. Tuck & Howell Plumbing, Heating & Air supports homeowners with HVAC maintenance, AC repair and system planning, plus related home service needs.