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HVAC air handler is 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 (Revision 07) for exceptions and alternative compliance paths.

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

Ducts Buried in Attic Insulation and Encapsulated
Encapsulated Ducts
Ducts Buried in Attic Insulation
Unvented Attic Insulation
Unvented, Insulated Crawlspaces
Application of Spray Foam Insulation Under Plywood and OSB Roof Sheathing
Ducts in Dropped Ceilings
Ducts in Raised Ceiling Sections
No Ducts or Air Handlers Located in Garage
Ducts in Interstitial Floor Framing