37 installation, maintenance and repair of building and commercial mechanical systems and heating, air conditioning and plumbing systems; installation of automated electronic lighting and energy controls; installation, maintenance and repair of building automation and energy systems, electrical, heating, ventilation and air conditioning (HVAC) equipment and major appliances for wholesale, industrial and commercial customers; pipe fitting installation and industrial construction and pipe fitting contractor services; installation, maintenance and repair of electronic equipment, humidifiers, indoor air quality systems, dehumidifiers, plumbing systems, electrical systems, surge protection systems, thermostats, and heating, ventilation and air conditioning equipment and systems; plumbing services; electrical contracting services; installation of lighting, heating, cooling and refrigeration systems; installation and repair of electrical and electronic devices and equipment, namely, commercial utility systems, heating, cooling, lighting, refrigeration systems, and electric power systems including generation, transmission, and distribution facilities