^ I usually have my A/C cleaned pag may amoy na (which is around every 3-5 years). I keep my interior clean, keep the car clean of leaves when/after parked (these small leaves find their way into the A/C.. .always) and rarely drive with the windows down. with the A/C filter equipped cars, i'd assume mas matagal pa. The A/C filter is changed every 20,000kms.