Air-conditioning system installation and repair; Air conditioning apparatus installation and repair; Repair and maintenance of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Repair of air-conditioning apparatus; Repair of air conditioners; Repair of household appliances and of residential heating, plumbing, air conditioning, and electrical systems; Installation and repair of air-conditioning apparatus; Installation and repair of air-conditioning systems; Installation and repair of heating, ventilating and air-conditioning systems; Installation and repair of heating, ventilating and air conditioning equipment; Installation, maintenance and repair of cooling and air-conditioning systems for temperature-controlled environments; Maintenance and repair of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Provision of information relating to the repair or maintenance of air-conditioning apparatus