37 Construction and maintenance of thermal energy facilities processing, treatment, storage and distribution facilities; Construction and maintenance of thermal energy generation plants, power meters and regulating stations for thermal energy generation plants; Construction and maintenance of electricity storage plants and associated equipment; Construction and maintenance of energy facilities, namely, processing, treatment, storage and distribution facilities; Construction and maintenance of electrical energy generation plants, power meters and regulating stations for electrical energy generation plants; Heating contractor services; design, installation, maintenance and repair of electric heating systems; advisory services relating to the installation of electric heating systems; design, installation, maintenance and repair of HVAC systems