Does Return Duct Need To Be Insulated

Be careful as you choose from the various insulation options. Typically in residential basement applications they are not insulated. The most applicable repair for duct temperature loss is adding insulation.

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Un insulated cold air ducts very often have surface temperatures below the local dew point.

Does return duct need to be insulated.

For instance a 2 5 ton system approximately 400 cfm per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct to move the 1000 cfm required by the 2 5 ton system. Answered october 21 2019. Department of energy codes ashrae 90 1 2007 and 2010 indicates that returns should in fact be insulated though not usually with the same insulation thickness as the supply. Hvac ductwork sizing is critical for proper heating and cooling in every room.

Then close off that supply and insulate the ducts. If the basement crawlspace is sealed add a return. Cool air passing through warm areas in your home can cause condensation in the ductwork. These ductwork tips will help balance your air conditioning and heating system.

Some insulation types offer high promises but fail to consistently perform in the field. Ductwork insulation prevents condensation. The school of thought used to be that return ducts only need to be insulated if they pass through an area where the ambient temperature will negatively affect the temperature of the returned air. If its not sealed.

This arrangement also reduces system first cost. Most technicians are skeptical about these numbers especially on the return air side of the system. However in recent years u s. Return air ducting is necessary in almost every room.

Exhaust air ducts normally do not need insulation. Return air ducts only need to be insulated if they pass through environments that adversely affect the return air temperature. Have to get the air back to the furnace. Condensation will cause a multitude of issues that you definitely want to avoid.

This condensation leads to moisture buildup inside the enclosed space of the duct system. Supply air ducts may be left un insulated if they run exposed through the space being conditioned. If the return duct is subjected to unconditioned air condensation may form and it will need to be insulated. Insulation prevents condensation and dripping from ducts.

In turn the moisture can lead to all sorts of problems such as mold and mildew growth. As you consider adding insulation first be sure the duct system is delivering proper airflow.

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