Coils, both indoor and outdoor, should be cleaned regularly as part of an on-going maintenance program:

A build up of dirt on coils can cause increases in evaporating and condensing temperatures. The coils are the parts of the system where the heat transfer takes place and dirt on a coil will form a barrier to heat transfer -effectively insulating the coil. This will lead to an overall increase in the running costs of any refrigeration and air conditioning system.

Heavy dirt build up can also clog the coil and reduce the air flow: on indoor coils this will contribute to poor indoor air quality and can act as a source of contamination.

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