Faced with mounting energy costs, property owners are constantly looking for ways to reduce the cost of heating and cooling large commercial buildings. That need has led to the birth of a whole new industry -- energy management -- and a new company in the Washington area.

Combustioneer, a Washington airconditioning and heating firm, has formed a joint venture with Energy Management Corp. of New York, an energy engineering and management firm.

The new firm, Combustioneer/Energy Management Corp., will provide comprehensive energy audits and analyses of a building's energy system, make recommendations, perform any work that is needed and monitor the building.

According to Ronald Wood, president of Combustioneer, a typical energy audit takes from seven to 10 days to complete. "The audit gives the owner a complete study of the building and the system. He should have a total picture of what he can do and what is best for his building," he said.

The remedies taken may include simple modifications of existing equipment or major replacement of heating and cooling systems.

"Every building is different," said Wood. "There are a lot of older buildings in D.C. The mainstay of this company will be existing buildings."

Not all buildings need an energy overhaul, Wood said. "We look at the number of pay-back years. If it's over three years, we don't feel it's a viable option. Most people are looking for a pay-back within a three year period."

He said that owners may realize savings of anywhere from 10 to 40 percent and that owners of condominiums or large apartment buildings may pass some of these savings on to their tenants.

Wood said the company "felt since the 1973 energy crisis that there is an energy management need in the Washington area. But we did not have the energy management background to put that new hat on." They contacted Energy Management, which has been engaged in energy management for the past five years.

"They will provide the engineering and energy management know-how, and we will provide the service work," he said.

Combustioneer, a division of John J. Kirlin Co., was founded in 1929. It is headquartered in Rockville and employs 40 service mechanics.

Combustioneer/Energy Management Corp. has offices at 818 18th St. NW. The office is headed by Michael Haidon, regional marketing director.

The Washington law firm of Anderson and Pendleton has moved into its new offices at 1000 Connecticut Ave. NW. Leasing for the 4,100-square-foot space was arranged by the Smithy Companies.

Kayne/Levin/Neilson/Bavar Realtors has leased 8,000 square feet of office space in the Patuxent Building in the Baltimore-Washington Industrial Park to DJB Sales, an engineering firm engaged in the manufacture of heavy-duty earthmoving equipment. The British company will use the space for its American sales and service center. KLNB also leased space in the same building to Drake Cake, a subsidiary of the Borden Co. The 5,400 square feet of space will serve as the company's Baltimore-Washington distribution center.

Federal Express Corp. has leased 2,244 square feet of office space at 1235 Jefferson Davis Highway in Arlington from First Gateway Associates. The $160,000 lease was negotiated by Arthur Rubloff & Co. Rubloff also represented Federal Express and Braddock Ravensworth Limited Partnership in the leasing of a 21,000-square-foot industrial building and a 6,300-square-foot office building on two acres in Springfield. The transaction was valued at more than $200,000.

* Kent Watkins & Associates, a Washington-based computer software company, has signed a five-year lease for 4,360 square feet at 1901 Fort Myer Dr. in Arlington. The lease, arranged by Arthur Rubloff & Co., was valued at more than $300,000.