HVAC Issues – Heating and Air Conditioning

Air leakage in forced air duct systems is now recognized as a major source of energy waste in both new and existing houses.  Studies indicate ductwork air leakage can account for as much as 25% of total house energy loss and can prevent heating and cooling systems from operating properly, resulting in uneven heating and cooling of rooms.


Air leakage into wall cavities and ceilings, because of poorly sealed or installed ductwork register boots, ranks at the top of the list, due to the volume of air which leaks during operation of the heating and cooling systems.  These leaks can heat or cool entire wall cavities and is the largest contributor to condensation.  Most if not all of these register boots are un-insulated or sealed at the drywall/boot junction.

Air leaks can also cause condensation resulting in mold/mildew growth.  Condensation may be identified through basic visual inspection if it has lead to obvious defects, such as staining or mold growth.  However, by the time visible evidence has presented itself, significant damage may have already been done. In many cases, condensation may have been developing for awhile before obvious signs become apparent.

Heat pumps are quickly inspected with infrared thermography.  An uneven heat distribution (mixed areas of warm and cool) on the condensing coil would be an indication of an improperly functioning A/C or heat pump system.

Ductless heat pump in cooling mode.