The energy efficient residence built by David C. Smith for the Research Foundation Inc. will not be open today at Mt. Airy, Md., as reported in the real estate section of The Washington Post yesterday. The house will be open to the public on June 4 and 5.

An experimental house - equipped with a dozen meters to measure energy use of different appliances and electric heating, cooling and water heating systems - will be open to the public today and Sunday in Mt. Airy, Md. The basement meters will be monitored for comparison when the house is occupied.

The energy-efficient residence was built under contract with the Department of Housing and Urban Development by the Research Foundation, Inc., of the National Association of Home Builders. The builder of the one-story rambler with carport was David C. Smith of Gaithersburg, an NAHB member. The house is expected to be priced in the upper $50,000s.

"We have designed and built this house to measure whether it provides a practical and economical approach to energy conservation in high energy cost areas," said Ralph J. Johnson, president of the research foundation and a professional engineer. "Preliminary estimates indicate that additional construction costs for this type of house will run about $3,000."

"The energy-saving products and techniques in the house are cost-effective; that is, they should pay for themselves within a reasonable period because of the savings in energy costs to the home owner over several years," added Danald Luebs, the engineer who headed the project for HANB. "Furthermore, most of the materials and procedures we used can be adopted by builders today without major changes in their construction operations or home designs."

The house can be reached by driving north on Route 270 to the Damascus Rte. 27 exit. Follow Rte. 27 about 14 miles to Mt. Airy's Main Street, turn right on Flower Avenue to Merridale Boulevard and right on Merridale the cul de sac on which the house is located.