official source ten to fifteen a long time.The air filter prevents dust together with other contaminants from moving into the AC unit. This stops Dust from accumulating inside the AC which may lead to overheating find more information and possible hurt. The air filter also helps you to keep the air fresh by removing pollutants from the air.Remove front plate and vacuum the coils using a soft brush attachment. In case you go ahead and take unit exterior, you can hose them off if you're taking treatment not to obtain the motor or electronics moist.