Dirt and grime build up on air conditioner coils  causes the system to work harder. Not only that, but dirty air conditioner coils increases the cost to run your system and decreases cooling efficiency. Dirty coils also reduce the life span of your equipment and they interfere with the adequate heat transfer, requiring more electricity to run the system. Dirty evaporators can spread mold and other contaminants, causing poor indoor air quality, which leads to the potential for people to experience respiratory issues. A clean system lasts longer, works at peak efficiency and saves the cost of expensive repairs. You can improve the efficiency of your cooling system 16% just by cleaning the evaporator and air conditioning coils.