'Green' house effect

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FRISCO, Texas - Builder Jim Sargent paused on the staircase of the model home, sweat glistening on his forehead as the temperature outside rose into the 90s.

"Feel that breeze?" Mr. Sargent said. The draft's cooling effect didn't happen by accident. Mr. Sargent pointed out large casement windows that swing out, catching the prevailing southern winds, and the skylight that can be opened to let warm air escape.

Mr. Sargent's house is designed to produce as much energy as it uses. The U.S. Department of Energy estimates that the average family spends $1,400 a year to run its house, with about half going for heating and cooling. The agency provides technical help to builders such as Mr. Sargent to encourage energy-efficient and "green" home construction, or "zero energy" houses.

The Energy Department estimates that homes and commercial buildings consume about one-third of all the energy used in the United States.

"If you don't do something now, these homes are going to use more energy for the next 50 years," said Tim Merrigan, a senior program manager with the National Renewable Energy Laboratory in Golden, Colo. "If you can make them more efficient, we can reduce our energy use and reduce dependence on foreign fuels."

Mr. Merrigan estimated that there are about 20 zero-energy homes around the country, mostly in California. None produces all the power it needs, but a few come close, he said.

Mr. Sargent is showing his 3,800-square-foot house, with a $950,000 asking price, during an annual parade of homes sponsored by Dallas builders. The two-story house in this fast-growing Dallas suburb features a collection of designs and gadgets, from new insulating materials to a device that recycles hot air from the gas fireplace through the heating and air-conditioning system.

The exterior walls are made of 10-inch-thick blocks of recycled softwoods and concrete. The metal roof reflects most of the sun's rays, helping keep the attic cooler.

"Our purpose in building this house is to demonstrate what can be done," said Mr. Sargent, a custom-home builder from Waxahachie, a community south of Dallas. "It's possible to build a house that is comfortable to live in, is architecturally pleasing, and doesn't have a utility bill."

Mr. Sargent said the house also uses new construction materials that are less environmentally harmful to produce than the products they replace.