Keeping your air ducts clean and in good working order is one of the most important aspects of home maintenance. Failure to keep the air ducts clean can, and often does, result in an overworked furnace, unexpected breakdowns and elevated energy bills. Dirty air ducts are also a major cause of respiratory problems including allergies and asthma. But while home air duct cleaning is a crucial aspect of home maintenance it’s not always easy to pick a company to perform the work for you. That’s because the nature of the work - little understood, performed out of sight - tends to attract all kinds of bogus, self-appointed ‘experts’ who know no more about air ducts than we do about aircraft engines. So, how do you separate the air duct cleaning pros from the frauds? Below we’ll provide 5 ways.