Clifford W. Perrin, 69, a founder and former president of Perrin & Martin Inc., mechancial contractors who install heating and air conditioning equipment, died Thursday at the Manor Care nursing home in Arlington. He had a neurological disorder.

Mr. Perrin, who was born in Richmond, Va., moved to Washington in 1936 and worked in the roofing, heating and air conditioning businesses. He founded Perrin & Martin in 1950. The firm came to specialize in heating and air conditioning for large commercial and residential projects. It also did roofing.

Mr. Perrin remained president of the company until he retired in 1978.

He was a director of the Arlington Trust Company and a director-emeritus of the First American Bank of Virginia. He was a former member and chairman of the Arlington Board of Zoning Appeals, a field adviser to the Small Business Administration, and a member of the Northern Virginia Builders Association, the National Home Builders Association, the Arlington Chamber of Commerce, the Washington Board of Trade, and the Washington Golf and Country Club, where he was known as an avid golfer.

Survivors include his wife, Beatrice, of Arlington; one daughter, Jenneane P. Hawthorne, of Naples, Fla.; one son, Clifford W. Jr., of Richmond; one brother, J. Kennon, of Richmond; two sisters, Elizabeth Kirby, of Alexandria, and Katherine P. Booker, of Richmond, and five grandchildren.