Air-conditioning system installation and repair; Heating contractor services; Heating equipment installation and repair; General contractor services, namely, plumbing, heating and air conditioning, carpentry, drywall, painting, electrical, building and framing contractor services; Installation and repair of heating, ventilating and air-conditioning systems; Installation of heating and cooling apparatus; Installation of heating equipment; Installation of heating systems; Installation of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Maintenance and repair of heating installations; Maintenance and repair of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Repair and maintenance of air-conditioning apparatus; Repair and maintenance of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Repair of heating apparatus