37 Installation and servicing being repair and maintenance of pipes, valves, meters, trucks, tanks and storage vessels used in the supply of natural and liquefied petroleum gas to residential, commercial and industrial users; installation and servicing being repair and maintenance of gas fired appliances and equipment, namely, air conditioners, boilers, burners, carbon dioxide generators, clothes dryers, coffee makers, deep fat fryers, dish washers, food and dish warmers, furnaces, fireplaces, fireplace heaters, space heaters, water heaters, swimming pool heaters, hot plates and griddles, humidifiers, incinerators, ovens, ranges, smoke houses, toasters, barbecues and lights; installation and servicing being repair and maintenance of accessories for gas fired appliances and equipment, namely, automatic burner ignition and safety shut-off devices, combination controls for gas appliances, connectors for gas appliances, drip tubes for water heaters, draft hoods, petroleum gas hose, couplings and assemblies, pressure regulators, quick-disconnect devices, thermostats, and valves; installation and servicing being repair and maintenance of household appliances, namely, electric dishwashers, electric clothes washers, electric refrigerators, electric freezers, electric dryers, barbeques, barbeque accessories, trashmashers, microwave ovens, air cleaners, dehumidifiers, vacuum cleaners, central vacuum cleaners, humidifiers, dehumidifiers, smoke and fire detectors, household security systems and fire extinguishers; installation of insulation, aluminum doors and windows, aluminum and vinyl siding, soffit, fascia, and eaves trough; installation of external and internal air filtration controls for buildings; installation and servicing being repair and maintenance of natural gas vehicle equipment and accessories; remedial maintenance services to increase efficiency and performance of buildings; home renovations being the repair, construction, remodeling, and maintenance of buildings; pipeline maintenance services; general construction contracting services; electrical contracting services; construction, repair and maintenance of residential and commercial buildings; commercial building renovation and repair services; construction and installation of pipelines; water and oil well drilling; house painting services; janitorial services; installation and maintenance of burglar and/or fire alarms and heating and cooling hvac systems; consulting services in the field of pipeline maintenance