What is the problem with some dust or a small amount of soil in ducts that would need you to either clean it yourself or call for a reliable duct cleaning service? A lot, there really are several issues everyone is talking about due to filthy ducts, including increased energy prices to health complications.
The heating and cooling of your HVAC system can be made ineffective by dust and soil. In winter months, soil clogged heat switchers and furnaces cannot heat up your home as economically as it should do. In addition to this condensing coils clogged by dirt cannot make the air cool enough in the summertime. The result means the run time of the HVAC systems can dramatically increase during these times therefore to make your home warm or cool, the dirty system simply needs extra energy, consuming more fuel and costing more money to run.
Air flow can be hampered by soil and dust. Yes, your HVAC system is performing to its maximum capacity to give you the coolest or warmest environment. But when the filter of the air is bunged up by dust it can render the system useless and unable to perform effectively to make your house cool or warm, which in turn will force it to consume more energy just to keep you comfy.