The answer to 'why is my evaporator coil' is that the evaporator coil may be dirty, damaged, or improperly sized for your HVAC system. A dirty or blocked evaporator coil can't effectively absorb heat from the air, leading to reduced cooling performance, higher energy bills, and potential system failure.
Common causes include dust, dirt, and debris buildup on the coil, refrigerant leaks, airflow blockages, and improper installation or sizing. Symptoms may include poor cooling, warm air from vents, high humidity, and ice buildup on the coil.