On the other hand there are many more air duct cleaning companies that will properly clean the air system and air ducts and use commercial negative air duct cleaning vacuums with at least 2,000 CFMs of vacuum power and utilize proper agitating tools to move the contaminates within the duct work to be captured with HEPA filters and contained by the air duct cleaning vacuum equipment.
Our air duct cleaning technicians check for dust, dirt, pollen, animal dander and other airborne contaminants that are pulled into your HVAC system every time the furnace or air conditioner runs. Over time, they build up inside your ductwork, making your air duct system a breeding ground for mold spores, bacteria, fungus, mildew and other microbes, which are then re-circulated through your home, impacting the health and comfort of your family.
Assuring that your air ducts and air systems will be properly cleaned with the correct equipment, personnel has the proper training and is a Florida licensed Mechanical Contractor and that has the expertise in cleaning your home or building, is a small price to pay for the possible health benefits for you, your family, or the occupants of the building.
"Energy is consumed by HVAC systems through a number of processes. Air is typically distributed through the ductwork via an electrically‐powered fan. Cooling coils remove heat from the air. Heating coils add heat to the air. Through normal HVAC usage, particulates in the air slowlycollects on the surfaces of various HVAC components, resulting in a gradual loss of energy efficiency. Some loss of efficiency via a single dirty component may be minor. When the loss through each component is added up, however, the impact could be considerable. Generally, the greater the buildup, the greater the energy loss. Removal of the buildup of particulate on HVAC components restores energy performance to the system." 
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