You need to clean the air filter about every 2 weeks of operaiton. If you keep the filter clean, you should make 2 or 3 years before you ahve to clean the evaporator coil. Every year take off the inside cover and brush and lint and dirt build up from the unit and evaporator coil. Also remove the outside cover and make sure the condenser coil is clean. Inspect for any mud daubber nest as well.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot