The following remarks were made regarding the article “Contractors Discuss the State of HVAC System Odor Complaints” written by Angela D. Harris, technology editor of The NEWS, published June 10.

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One common customer complaint about their central HVAC systems is that the a/c system is running but not providing any cool air to the controlled space. One of the most common reasons for this situation is that the a/c condenser or evaporator coil has frozen over. This term or phrase literally means that ice has formed on the heat exchanger, preventing the transfer of heat since the ice is acting as an insulator.