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Commercial, industrial, institutional, residential heating, ventilating and air conditioning and air filtration (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

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; plumbing services; electrical contracting; and electrical contractor services

Design of HVAC and DDC control apparatus for heating, ventilation, and air conditioning systems; inspection of HVAC and DDC control systems