We believe a home that uses air conditioner to a regular standard use should clean their filters every 3 months; if you have exceptionally high use we believe you should clean your filters monthly. The more you clean them the healthier your air will be and the less dollars you will spend on running costs.
For standard dust catching filters you should remove the filter and hose out. Gently tap each side of the filter on the ground to remove excess water, leave out side to dry and return to your system.