Description: Installation, maintenance and repair of HVAC and DDC control systems' HVAC contractor services; installation, repair and maintenance of heating equipment; air conditioning contractor services; installation and repair of air conditioning and indoor air quality apparatus and systems; air duct cleaning services and indoor air quality maintenance services; repair service and maintenance of HVAC systems in commercial, industrial, institutional and residential buildings; plumbing contractor services; electrical contracting; and electrical contractor services; Commercial, industrial, institutional, residential heating, ventilating and air conditioning (HVAC) apparatus and components thereof, namely, gas circulation apparatus comprised of tubes, pipes and pre-assembled manifolds through which cooled or warmed gas circulates; electrical and gas fired furnaces; chillers, namely, air and water chillers; split composite apparatus comprised of air conditioners, heat pumps, condensing units, air conditioner compressors, ceiling mounts and floor mounts; built-ups comprised of VAV (variable air volume speed) dampers, roof-top air conditioning units, air handlers; custom heat control apparatus composed of tubes, pipes and pre-assembled manifolds through which cooled or warmed air or liquid circulates; ventilation apparatus comprised of exhaust hoods, exhaust fans, and duct work for conditioning and purifying air; air doors for use at entrance doorways of refrigerated, air conditioned or heated rooms and buildings; evaporative coolers; "AIR"; Design of HVAC and DDC control apparatus for heating, ventilation and air conditioning systems; inspection of HVAC and DDC control systems
