Home air conditioning systems typically use disposable paper filters design to trap airborne particles in their fibers. These filters generally last between 3-6 months depending on environmental factors. Excess humidity, dust and organic particles like pollen can cause effective life to drop in Florida. It is generally recommended for disposable filters in Florida to be replaced every 3 months or sooner if visible dirt has accumulated on your filter. If your air filter is getting dirty at a much faster rate than that give one of our ProMag air conditioning repair service technicians a call anytime.