Duct System Problems are Common

Ducts

Q. Are most residential central air conditioning and heating duct systems installed properly?

A. According to the Consortium for Energy Efficiency, the answer is no.  Most residential systems are not installed properly.  Studies conducted by the Proctor group have reached pretty much the same conclusions at the same proportions.

  • Equipment is over sized about 47% of the time.
  • Refrigerant charge is too much or too little  about 44% of the time.
  • Air flow is inadequate about 70% of the time.

These problems not only reduce comfort levels inside the home, but make heating and air conditioning systems more expensive to operate. Correcting these problems could reduce air conditioning peak demand by as much as 14 % in existing homes and 25 % in new construction.

Air flow problems due to poorly designed and installed duct systems is a big (but little understood) problem in the HVAC industry.  A big part of the problem has always been identifying and quantifying duct system problems. Prior to advent of new tools like Total Performance Diagnostics, finding duct system problems was an arduous and time consuming task.

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