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Although historically, some codes have included ventilation requirements for crawlspaces in homes, the energy code does allow both vented and unvented crawlspaces.
Air Distribution System Design (173 kb)
Buildings that are more Central heating and cooling systems use an air distribution or duct system to circulate heated and/or cooled air to all the conditioned rooms in a house.
Efficient Duct Systems (76 KB)To create a comfortable home, an efficient duct system is a must. Duct systems found in ENERGY STAR qualified homes are third-party tested for tightness and verified to be properly insulated.
Residential Thermal Distribution Systems generally refer to the method of distributing heating and cooling throughout a house.
Efficient Duct Systems (71 KB)Sealing holes and cracks in the home's "envelope" and in heating and cooling duct systems helps reduce drafts, moisture, dust, pollen, and noise. A tightly sealed home improves comfort and indoor air ...
Improving the Efficiency of Your Duct System (1.3 MB)THE DUCT SYSTEM, used in air heating and air cooling your home, is a collection of tubes that distributes the heated or cooled air to the various rooms.
Better Duct Systems for Home Heating and Cooling (12.7 MB)This is a series of six guides intended to provide a working knowledge of residential heating and cooling duct systems, an understanding of the major issues concerning efficiency, comfort, health, and...
Codes allow conditioned crawlspaces with mechanical ventilation instead of crawlspaces with passive vents to the outdoors. However, code officials and builders are often uncertain about the design de...
Washington State Energy Code Duct Leakage Study Report (1.5 MB)The Washington State Energy Code requires that all ductwork installed outside of the conditioned space be sealed.
Crawlspace Insulation (235 KB)A properly sealed, moisture-protected, and insulated crawlspace will increase comfort, save on energy costs, improve the durability of the home, and reduce entry of moisture, radon, and other potentia...