Air control: By removing moisture and pollutants from indoor air, Carrier's energy recovery ventilator has a high-efficiency core and prefilter that cleans outdoor air prior to entering the home. It helps prevent mold problems, at the same time improving air quality.

"Green" wallboard: The 1/2-inch gypsum drywall from Temple used in Homelink can make a rare environmental claim. Scientific Certification Systems, based in California, certifies the product to contain 95 percent recycled materials. The home includes moisture-resistant versions of the product as well.

Water shield: Keeping water away from basement walls was paramount. The builder used Koch Waterproofing's Tuff-N-Dri, a two-part system with a 15-year transferable warranty. The application process consists of spraying on a polymer-modified asphalt emulsion, then protecting it with an inorganic glass fiber insulation/drainage board.

Low-cost flashing: Dupont Tyvek's FlexWrap is essentially a self-adhesive, 6-inch-wide strip of polyethylene sheeting placed like "Z" flashing between foam panels. It also was used on the home's exterior, around windows and doors, to provide a durable, weathertight seal.

Easy breathing: One-inch-thick extruded polystyrene, applied to the inside of basement walls, helps control humidity levels. Unlike exterior sheathing, these panels should have no laminate skins, so that they have enough permeability to allow wet areas to dry out before mold can form. No more than 1-inch thickness is recommended.

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