The answer to 'why is my evaporator coil high energy bills' is that a dirty or malfunctioning evaporator coil can significantly increase your energy bills. The evaporator coil is responsible for absorbing heat from the air inside your home, and if it's not working efficiently, your HVAC system has to work harder to maintain the desired temperature, leading to higher energy consumption and costs.
Some common causes of a high-energy evaporator coil include a buildup of dust, dirt, or debris on the coil, a refrigerant leak, or a problem with the blower fan. These issues can reduce the coil's ability to effectively transfer heat, forcing the system to run longer and use more energy.