Plumbing; Air-conditioning system installation and repair; Air conditioning apparatus installation and repair; Air conditioning contractor services; Electrical contractor services; Electrical repairs, maintenance, and installation of electrical wiring, outlets, light fixtures, and electrical panels; Heating contractor services; HVAC contractor services; Plumbing contractor services; Plumbing installation advisory services; Plumbing maintenance advisory services; Plumbing repair advisory services; Plumbing services; Contractor services, namely, review of and remedial recommendations for building plumbing, electrical and mechanical systems for others; Installation and replacement service for heating, ventilating and air conditioning systems; Installation of electrical wiring; Installation of HVAC systems; Installation of plumbing; Installation of plumbing systems; Installation of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Installation, maintenance and repair of air-conditioning systems; Maintenance and repair of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Maintenance of plumbing; Repair and maintenance of air-conditioning apparatus; Repair and maintenance of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Repair of household appliances and of residential heating, plumbing, air conditioning, and electrical systems