i have both of my cars' a/c cleaned annually since 1 is very old and the other turning 3 yrs. dati kasi with the old car, when i begin to experience problems with the a/c eh dun lang ako nagpapalinis (in a span of 2-3 yrs), lagi nagkakaleak yung cooling coil so lagi palit (mga 3x na ko nagpalit), so i started the habit of having it cleaned annually, so far so good naman. anyway i'm not sure kung may benefits tong ginagawa ko kasi cleaning costs around 2-3k so i try to budget na lang.