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HVAC (Heating, ventilation and air conditioning) installation, maintenance and repair; Retrofitting of heating installations in buildings; Retrofitting of heating, ventilating and air conditioning installations in buildings; Retrofitting of air conditioning installations in buildings; Retrofitting of ventilating installations in buildings; Installation of apparatus for heating; Installation of heating and cooling apparatus; Installation of apparatus for air-conditioning; Installation of air conditioning apparatus for use in clean rooms; Installation of dust extraction apparatus; Installation of apparatus for ventilating; Installation of solar heating systems; Installation of environmental control systems; Installation of clean room environmental control systems; Installation of clean room systems; Installation of ventilation and dust extraction systems; Installation and repair of air-conditioning apparatus; Heating equipment installation and repair; Installation, maintenance and repair of air-conditioning apparatus; Installation, repair and maintenance of heating equipment; Installation, repair and maintenance of air reheaters; Installation of central heating apparatus; Routine servicing of heating apparatus; Routine servicing of air conditioning apparatus; Routine servicing of dust extraction apparatus; Routine servicing of ventilating apparatus; Air conditioning contractor services; Advisory services relating to the installation of heating and cooling apparatus; Deodorising services; Heating contractor services; Providing information relating to the repair or maintenance of air conditioning apparatus; Air duct cleaning services; Air conditioning vent sealing services; Routine servicing of drying apparatus; Maintenance of electronic or air conditioning systems; Maintenance and repair of heating; Maintenance and repair of solar heating installations; Refurbishment of air conditioning plant; Repair of air conditioning apparatus; Repair of heat recovery apparatus; Repair of ventilating apparatus; Repair of heating apparatus; Maintenance and repair of heating apparatus; Maintenance and repair of air conditioning apparatus; Maintenance and repair of dust extraction apparatus; Maintenance and repair of ventilating apparatus; Repair or maintenance of air conditioning apparatus; Repair or maintenance of air-conditioning apparatus [for industrial purposes]; Repair or maintenance of boilers; Providing information relating to the repair or maintenance of boilers; Providing information relating to the repair or maintenance of freezing machines and apparatus; Providing information relating to the installation of electrical apparatus; Providing information relating to the installation of machinery; Repair information; Machinery installation, maintenance and repair; Installation of skin-effect heating; Installation of electric heat tracing; Installation of heat exhaust systems; Installation of industrial heat tracing; Maintenance and repair of heat tracing; Repair of air filtering apparatus; Repair of electrical equipment; Maintenance and repair of refrigerating apparatus; Air conditioning apparatus cleaning services; Boiler repair services; Repair services for domestic electrical appliances; Maintenance of consumer electric appliances