Mechanical Design Systems, Inc

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.

Commercial Express HVAC provides heating, ventilation and air conditioning solutions to facility owners, managers and operators. Its services include preventive maintenance, budget analysis, energy and comfort-improving retrofits, 24-hour, seven-days a week emergency repair services, equipment replacement, design and build installations, and indoor air quality diagnosis. It also offers mechanical, electrical and structural engineering and permits, equipment rigging, roofing, power wiring, gas piping, ductwork, temperature control systems, equipment startup and commissioning, and follow-up preventive maintenance services. The company s technicians receive industry training, and the company has well-stocked trucks, supported with state-of-the-art tools and technologies. The company s technicians service all manufacturers brands and types of equipment, including package rooftop units, air-cooled split systems, water-cooled heat pumps, gas-fired equipment, chillers, boilers, pumps, and computer room air conditioning units. Commercial Express HVAC is located in Chantilly, Va.