Here are some signs that your AC coil may be clogged: 1. Reduced airflow: If you notice that the airflow from your AC vents has become weaker, it could be due to a clogged coil. 2. Warm air: If the air coming out of your AC vents is warm, it could mean that the refrigerant isn't cooling properly due to a clogged coil. 3. Increased energy bills: A clogged AC coil can cause your air conditioner to work harder and less efficiently, which can result in higher energy bills. 4. Frozen coils: If you see ice buildup on the coils, it usually means that the coil is clogged and causing the AC to work harder than it should. If you suspect that your AC coil is clogged, it's best to call a professional AC technician to clean and inspect your unit.