The answer to 'what does evaporator coil do' is that the evaporator coil is a critical component of your HVAC system that absorbs heat from the air inside your home. As warm air passes over the cold evaporator coil, the heat is extracted and the cooled air is then circulated back into your living space.
The evaporator coil contains refrigerant that absorbs heat as it evaporates, causing the air to cool. This cooled air is then blown over the evaporator coil and into your home by the blower fan. The evaporator coil works in conjunction with the compressor and condenser coil to create the cooling effect that keeps your home comfortable.