Advisory services relating to the installation of heating and cooling apparatus; Air conditioning apparatus cleaning services; Air conditioning apparatus installation and repair; Air conditioning contractor services; Air conditioning vent sealing services; Air duct cleaning services; Air-conditioning system installation and repair; HVAC contractor services; HVAC duct cleaning services; 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 replacement service for heating, ventilating and air conditioning systems; Installation of air-conditioning apparatus; Installation of air-conditioning apparatus for use in clean rooms; Installation of air-conditioning systems; Installation of heating and cooling apparatus; Installation of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Installation of heating, ventilation and air-conditioning systems; Installation of HVAC systems; Installation of industrial machinery; Installation of ventilating apparatus; Installation of ventilation and dust extraction systems; Installation, maintenance and repair of air analysis apparatus; Installation, maintenance and repair of air blowers; Installation, maintenance and repair of air filters; Installation, maintenance and repair of air pumps; Installation, maintenance and repair of air purifying apparatus; Installation, maintenance and repair of air-conditioning apparatus; Installation, maintenance and repair of air-conditioning systems; Installation, maintenance and repair of cooling and air-conditioning systems for temperature-controlled environments; Installation, maintenance and repair of ventilating apparatus; Installation, maintenance and repair of ventilating systems; Maintenance and repair of air-conditioning apparatus; Maintenance and repair of dust extraction apparatus; Maintenance of air conditioners; Providing information relating to the repair or maintenance of air-conditioning apparatus; Repair and maintenance of air-conditioning apparatus; Repair and maintenance of dust extraction apparatus; Repair and maintenance of heating, refrigerating, air-conditioning, drying, ventilating and dust extraction apparatus; Repair of air conditioners; Repair of air-conditioning apparatus; Repair of intake air filters and parts thereof; Repair of intake air filters for machinery; Repair or maintenance of air-conditioning apparatus