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Ducts located within the home’s thermal and air barrier boundary

There are several possible methods for locating the home’s HVAC system within the home’s thermal air barrier boundary. See the DOE Zero Energy Ready Home National Program Requirements for exceptions and alternative compliance paths.

The following Solution Center guides provide more information about these measures:

This guide describes approaches to buryng and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

Guide that illustrates how and when to encapsulate ductwork in unconditioned attics, increases the R-value of duct insulation, mitigating condensation issues and reducing air leakage.

This guides describes buried ducts in loose-fill attic insulation, a method that can only be used in dry climates.

Guide describing methods for insulating an unvented attic along the roof line.

Guide describing methods for insulating an unvented crawlspace or conditioned basement with rigid foam on the interior side of the walls to provide an insulated space for HVAC equipment.

Guide describing a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

Guide describing method for installing ducts in a duct chase above a dropped ceiling.

Guide describing method for designing and installing ducts in a raised ceiling chase. 

Guide describing how to design HVAC systems to be located within the conditioned space of the home, either in a utility closet or in an air sealed conditioned attic, basement, or crawl space.

Guide for designing and installing interior ducts in an interstitial floor cavity in new and existing homes.