Guides A-Z

Guide describing the use of building cavities as supply or return ducts.

Guide describing approaches to burying and encapsulating ducts in unconditioned attics to increase the overall R-value of duct insulation.

No outdoor air intakes connected to return side of the HVAC system, unless controls are installed to operate intermittently & automatically based on a timer and to restrict intake when not in use (e.g., motorized damper)

Guide describing options for adding dehumidification equipment to a home to maintain indoor relative humidity below 60%.

This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.