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Subscribe to our RSS Feed Common Evaporator Coil Issues That Can Hurt Your A/C

Wednesday, May 14, 2014

Your A/C makes a regular Chicago summer an outstanding one by providing cool relief on hot, humid days. Routine preventive maintenance can help keep your cooling system in top form throughout the season, but you may still experience evaporator coil issues from time to time that can hurt the performance and efficiency of your A/C. Here are some common evaporator coil issues that may require a call for A/C service.

How Do Evaporator Coils Work?

The evaporator coils are a vital component of your cooling system, located in the indoor unit of your A/C. Prior to the air conditioner cooling your inside air, a controlled series of events takes place:

  • The outdoor compressor pumps refrigerant in a continuous loop between the outdoor condensing coils and the indoor evaporator coils.
  • Warm air from inside your home is drawn into your cooling system by a large fan, and passes over the evaporator coil. During this process refrigerant inside the coil absorbs the heat in the air which results in cooled air.
  • The heated refrigerant, now in a gaseous state, continues its journey to the outside unit, where the compressor changes it back to a liquid. During this transition the resulting heat energy is expelled back into the air. The refrigerant then gets pumped back inside.

Common Evaporator Coil Issues

  • Dirt and particulates – Air is continuously passing over your evaporator coils, and any particulate contained in the air may fall on the coils, gradually coating them and reducing the efficiency of your A/C.
  • Freezing – Icy coils can place undue stress on your cooling system, reduce its cooling ability, or halt operation entirely. This may be caused by a number of factors, including:
    • Low refrigerant levels.
    • Insufficient airflow over the coils as a result of a malfunctioning fan motor or dirty air filter.
  • Moisture – Condensation on the coils as a result of vast temperature differences between warm inside air and the cold evaporator coils, can attract dirt, bacteria, dust or in extreme cases, mold, lowering the efficiency of your A/C and the quality of your indoor air.

For professional assistance with evaporator coil issues, please contact us at, proudly serving homeowners in Chicago, northwest Indiana and southwest Michigan.

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