Advanced Framing: Minimum Wall Studs Description Guide describing how to frame a wall with minimal wall studs to prevent heat loss through walls.
Ducts Buried in Attic Insulation Description This guides describes buried ducts in loose-fill attic insulation, a method that can only be used in dry climates.
Ducts in Interstitial Floor Framing Description Guide for designing and installing interior ducts in an interstitial floor cavity in new and existing homes.