Air-conditioning systems are designed in an ideal environment on a set of blue prints by an engineer who calculates the exact CFM or cubic feet per minute of air that is required to enter a room to maintain it at a set temperature and encourage air movement. This design of the air distribution or duct system is perhaps the most understated aspect of having a comfortable and healthy home. The design of the engineer in an office rarely if ever translates from the drawing to the reality of the actual installation in the field due to a multitude of variables. In residential homes the space in an attics, between floors, and crawl spaces is often filled with electrical wiring, gas piping, plumbing, ventilation systems, and structural supports that require all trades to reroute their materials to deal either with the preceding trade that worked on the home or the design of the structure that may not have been accurately reflected in the blue prints.

Most air-conditioning contractors understand this dilemma will be faced in the field by their installers and so they have a tendency to over design the duct system for maximum performance if the installation varies from the drawn prints. The problem occurs in that many homes built throughout the years have never had their air distribution system tested to see if they fell within the parameters of the design by the engineer. Even though engineers make over design to compensate for installation issues the installers may also have to make compensation for not being able to run the duct work as originally designed.

This creates even more air friction which reduces the efficiency of air delivery into various areas of the home. Poor installation techniques along with damage done to the air distribution after the inspection by the municipal authorities overseeing the construction of a home may lead to leakage in the ductwork that also creates problems with the air distribution system. Air distribution systems that are not delivering the proper CFM throughout the home typically indicate an inadequate airflow through the blower assembly, leaks or restrictions within the air distribution system, or a compromise of the initial design. Sadly however, most homeowners will never know whether their duct system functions as designed by the engineer.

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