37 Rental of equipment and supplies in the nature of hot water heaters, furnaces, air conditioning units and pipes, pipelines, stations, compressors, lines, fittings, filters, valves, regulators, meters, gauges, tanks, caverns, motors, pumps and facilities, all relating to hot water heaters, furnaces and air conditioning units for use in the production, namely, the extraction of oil and natural gas; maintenance and installation of home and commercial appliances, home and business security products, equipment and supplies for use in the production, generation, co-generation, distribution, transportation, transmission, storage, management, conservation, research and development and consumption of water resources and energy resources, including natural gas and natural gas liquids, refined products, electricity, oil and propane; Installation, maintenance and repair 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; installing, maintenance and repair 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; Installing, maintenance and repair 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; installing maintenance and repair 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; installing insulation, aluminum doors and windows, aluminum or vinyl siding, soffit and fascia and eaves trough; installing external and internal air filtration controls for buildings; repair, maintenance and installation of natural gas vehicle equipment and accessories; remedial maintenance services to increase efficiency and performance of air conditioning units, fireplace units, home heating units and air and heating ducts; renovations in the field of houses; 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 well and oil drilling; conservation on behalf of others in the nature of home energy assessment services for the purpose of determining home improvements needed to improve energy use and efficiency relating to petroleum, refined petroleum products, natural and liquefied gas, electrical energy, oil, propane and water; house painting services; janitorial services; installation, maintenance, and repair of environmental systems including heating and cooling, intruder and fire alarms and appliances and parts thereof; consulting services in the field of pipeline maintenance