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Air conditioning contractor services; Air conditioning vent sealing services; Air duct cleaning services; Boiler cleaning and repair; Heating contractor services; Heating equipment installation and repair; HVAC contractor services; Installation and repair of air conditioning apparatus; Installation and repair of heating, ventilating and air conditioning equipment; Installation and replacement service for heating, ventilating and air conditioning systems; Installation and replacement service for water heaters; Installation of environmentally compliant heating, air condition and ventilation equipment; Installation, repair and maintenance of heating equipment; Machinery installation, maintenance and repair; Maintenance and repair of heating installations; Repair of household appliances and of residential heating, plumbing, air conditioning, and electrical systems; Repair or maintenance of boilers; Technical consulting related to the installation of oil and gas equipment, control systems, and machinery