Installation, maintenance, and repair of plumbing, heating, cooling, air conditioning, and ventilation systems and equipment; Plumbing services; Plumbing and water installation; Furnace installation and repair; Repair of commercial and residential heating, cooling, air conditioning, and plumbing systems; Installation, maintenance, and repair of hydronic heating and cooling systems; Drain and sewer cleaning and rootering services; Installation, maintenance, and repair of water heaters, septic and sewer systems, and other plumbing installations; Septic tank pumping; Installation, maintenance, and repair of utility lines, namely, gas lines, sewer lines, and water lines; Installation, maintenance, and repair of household appliances; Installation, maintenance, and repair of electric appliances