C.A.S. needs to clean & check the condensor & the filter dryer once a year C.A.S. WILL do this as part of your Air Conditioning Service. In fact as its quite a simply job to do if you email us we will tell you how to do it for FREE. C.A.S. also checks the temperture acrose the dryer & condensor as well as other parts of your Air Conditioning System. Replacement of fan belts and other mechanical work that is not part of the Air Conditioning system are carried out by our's or the client service centre. Once site we will undertake a comprehensive review of your system and provide a quote for any service or repair work Radius of Matlock - we can come to you, whether at home, your workplace or your service centre . We thrive on solving unusal situations