What about the National Association of House Builders and solar energy? Well, the NAHB excutive committee this week come out with five pages on it policy on energy, including."However, despite what will be an increased demand for the use of solar energy in single family homes and commercial buildings, we advise our members to proceed cautiously in their consideration of solar systems. While there are a large number of reputable manufacturers of such systems. While there are a large number of reputable manufacturers of such systems, the state of the art is in its infancy and many of the devices are unproven. The NAHB Research Foundation and technical services department will continue to keep our mambers advised as solar technology improves. Solar heating of domestic hot water is now economically feasible in manny sections of the country. But, again, caution shuld be exercised both as to the geographic-allocation suitable for such solar heating and the costs effects not only for such system but also upon the structure of the house necessitated by the inclusion of solar heating for domestic hot water."

On that score, NAHB might do well to consult builder C. Co. (Cus) Yeonas, whose Yeonas Co., a division of Olin-American, installed solar systems for domestic hot water heating in a Vienna house more than a year ago. Yeonas said recently that the performance has been satisfactory. Yeonas added that more tax credit will be needed to stimulate greater rose of solar energy and that the fact that tax assessors take note of solar installations is hardly an incentive.

And when NAHB dedicated its new Housing Hall of Fame earlier this week, one of the plaques showed the on-not the honored father. Somehow there was a mix-up and a picture of Milton J. Brock Jr. was submitted by the Los Angeles building firm founded by his late father, who was the real honoree. The mistake will be corrected.

Some months ago it was announced that developer Alan Kay ;Rozality-Nay planned to purchase the [WORD ILLEGIBlE] Dodge Center office building on the Georgetown waterfront for a reported $15 million. It turned out to lie due of those sales that almost came off. Now the 9-story building, reclaimed 3217 K, is still in the possession of a real estate affiliate of Maloney Concrete, the developer of the brick structure that has a pyramid profile. There's still plenty of space to be leased in the structure that was completed last fall.

Remember Larry Hackenberg of Charlottesvill, Va.? He built and then wrote a book about green wood houses that can be built cheap by using unseasoned wood and leaping amenities to a minimum. Hackenberg, who is connected with the University of Virgirnia, writes that two of his green wood buildings are featured in an art show at the Second Street Gallery in Charlottesville. It continues through June 4.

Dealtor James L. Dixon, who was born in Newcastle-on-Tyne in Britain "too many years ago," got a tremendous charge when President Carter visited that industrial city in the north of England. "I doubt if many, if any, good citizens of the Washington area can claim this unusual distinction," wrote the creator of Jimmy Dixon memo grams. "My father's uncle, the Rev. James Lamb, was vicar in a parish there for 43 years and I am honored indeed to be named after this late noble gentleman as James Lamb Dixon." It may surprise some of Dixon's friends to learn that he is a Lamb.

Elmer L. Klavans, who turned from property management to renovating, remodeling and rehabbing some years ago and became a dominant and successful force in area real estate, is anticipating his 45th class reunion of Central High. The former oboe player, who has been gamely battling illness in recent years, lives in a house that he built on Bancroft Place NW. Among other things, it has a four-car garage.

The Manufactured Housing Institute, which is the trade association representing what used to be known as the mobile home industry, is moving next week from its own small (30,000 square feet, on two floors) building at 14650 Lee Rd., in the Chantilly area near Dulles Airport to smaller space in a Crystal City office building near National Airport. The MHI staff has been reduced to 14 sincd Walter Benning took over as top executive. (Mobile home sales slumped in recent years but are picking aup again.) The five-year-old Chantilly building on 13.5 acres is for sale and MHI hopes to get $1 million for it.

Miller & Smith, one of the area's volume home builders, decided last fall to offer a trade-in plan to buyers of Hunter Creek houses in the Herndon area. The plan permits the present owner of a condominium apartment or townhouse to be assured of the sale of that property before making a commitment to buy a new detached house from M&S. Richard Tiller said that 20 Miller & Smith customers have taken advantage of the plan and that a new section of Hunters Creek houses has been started. Prices are in the $50,000s and low $60,000s.

Add Henry Goldberg's name to the increasing list of health-exercise freaks in the building and real estate business. The 39-year-old head of Artery Organization, Inc., which now builds many rental apartments, lost 30 pounds two years ago on a water-only diet and he keeps his lithe figure now by jogging and mild exercise. A Chinese friend has him doing muscle-relaxing calisthenics too.

H.R. Crawford, formerly an assisstant secretary at HUD and now back as property manager at Edgewood. Terrace apartments in Noreast, recently was honored in Las Vegas, where a new community service center was named for him. Meanwhile, the unflappable Crawford is buying and redoing some older houses in the District and beating the drums for private enterprise and the "fantastics" new interest in inner-city residences.and he's likely to announce as a candidate for a City Council seat (at large) some day when he finds time.

How hot is the market? It caused a small broubaha at Fairlington Villages early this week, just before previously announced price rises were put into effect. One man was so upset at not being able to reserve a certain restored townhouse that he threatened sales manager Tommy Grimes with all sorts of legal action. But Grimes insisted it was first-some-first-sold. After some stroking, Grimes settled down the prospective buyer and got him to accept another' house.