The Fairfax County Redevelopment and Housing Authority is offering energy conservation and rehabilitation home improvement loans to low-moderate income homeowners in Fairfax County and Falls Church. Interest is 8 percent and terms 15 years. For information, dial 691-3085.

JayBee Builders has begun the sale of torwn houses being built on a 44-acre site in the Huntley Meadows Park area of Fairfax County. Called Deer Run Crossing, the subdivision is planned to have 62 town houses and 40 single houses. Architect Morton Noble has designed the houses for JayBee, headed by James L. Brehony.

The area chapter of the American Society of Appraisers will hear William Murdock discuss current trends in title insurance at a meeting Tuesday evening at Fort McNair.

Burr, Morris & Pardoe has announced that 80 percent of the apartments have been sold in the 100-unit 3900 Tunlaw building that is being converted to condominium ownership in Northwest. Prices of remaining units range from $50,800 to $67,000.

The Prince George's County Board of Realtors has moved its office to 96 Harry S. Truman Drive, Largo, Md.

A series of real estate courses will be given at the Annandale campus of Northern Virginia Community college, beginning Monday. For information, call Len Palumbo, 323-3163.

Pulte Home Corp. has opened a subdivision called Collington Green in the Bowie area of Prince George's County. Prices begin at $58,990 for the single houses with three to five bedrooms. The Pulte firm is a member of the Home Owners Warranty program, which offers a 10-year buyer protection plan.

The Washington Board of Realtors will feature William Whiteside, executive director of the Neighborhood Reinvestment Corp., at a Private Property Week luncheon April 17 at the Capital Hilton.

The Washington chapter of the National Home Improvement Council has been named winner of two awards in the 1978 consumer progran competition held by NHIC. Moses Voloshen, president of the area chapter, accepted the awards at a recent convention held in Chicago.

The Northern Virginia Board of Realtors will hold its annual awards dinner-dance April 7 at the Washington Hilton.

H.G. Smithy Co. recently arranged a long-term financing package of more than $5 million for the expansion of the Town Center shopping center in Sterling, Va. The firm also arranged a $6.7 mortgage for the 1776 Plaza at 1776 E. Jefferson St., Rockville.