Remember; think about your air system as the lungs of your home. Then consider the type of company that you want to handle your home’s lungs and your indoor air quality within your home. Have the complete air system periodically inspected for contaminated duct work and have it properly maintained so your Heating and Air System can provide your family with good air quality for years to come. Qualified air duct cleaners will follow strict standards set by the National Air Duct Cleaners Association. Allowing an unqualified contractor to clean your ducts could be worse than not having them cleaned at all. More particles could be broken up and released into your home or your HVAC system could be damaged.
Make use of a business that will offer a reasonable quote, based upon the service that they will offer. Be tired of business that market one cost for an entire home. Consider it, would a painter paint any size home for one low price? Neither can a duct cleaner PROPERLY clean the entire home, no matter the number of systems or air vents remain in the house for one low price.
"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." 

Make sure that the company has the proper equipment and enough HEPA filtered vacuum power (2,000 CFMs or more), to properly clean your air ducts. Be weary of companies that use small vacuum units that have a small rotating brush on the end of a small vacuum hose with a typical airflow of 150 to 300 cfm or less. Proper air duct cleaning vacuums are negative air machines with 2,000 CFMs have 8 inch to 14 inch or larger, vacuum hoses to capture large quantities of dust and debris.
Of the cleaning services in which we are proud to be specialists, air duct cleaning is by far the one that requires the most trust between the consumer and the air duct cleaning service provider.  There are many unscrupulous air duct cleaning companies purporting to be something they are not, many advertisements using unrealistic scare tactics, and of course bait and switch tactics are prevalent in the industry.  You need to feel confident in the professionalism of the firm you hire to clean your air ducts because you are asking someone to clean the inside of your duct work, where it can be difficult to see the results of the job.

"This a very professional company that came the next day after being contacted late in the day prior. The two guys that came to the door that did the work were well dressed and very courteous. They cleaned my diver vent and it works perfectly. I have their literature and will be calling them when I m ready for duct cleaning. Nice equipment too! Thanks for the good work. Nice not to have scroungy guys showing up at the door. "

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