Callaham HVAC Services, 9713 Woodyard Cir, Upper Marlboro, MD 20772, US

Ronco Mechanical Contractors provides mechanical services for projects that brings it into theatres, retirement communities, technical facilities, libraries, apartment complexes, office buildings, condominium high-rises, hospitals, detention centers, colleges, universities and stadiums. The company provides plumbing, heating, ventilation and air conditioning services for commercial and industrial projects in Washington, D.C. Its service area extends from Baltimore to Richmond, Va. Ronco's field support is comprised of several levels of tradesmen who specialize in plumbing, steam-fitting and welding. The company also employs many registered apprentices in the plumbing and heating, ventilation and air conditioning trade. Located in Clinton, Md., Ronald F. Wilson established Ronco Mechanical Contractors in 1960.