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Sometimes the presence of dust or dirt isn't enough to warrant a full cleaning of a home or office air conditioning system. In some cases, however, a cleaning is definitely worth the time and expense. The EPA recommends a cleaning if you see particles blown from the vent system into your home or office spaces. These visible particles can be symptoms of problems with your central air system--problems that must be fixed or you could find yourself dealing with the dirt issue once more. Have your system inspected before paying for a cleaning.