Electrical repairs and installation of heating, air conditioning, and refrigeration equipment.; General contractor services, namely, plumbing, heating and air conditioning, carpentry, drywall, painting, electrical, building and framing contractor services; Heating contractor services; Heating equipment installation and repair; HVAC contractor services; Installation and repair of heating, ventilating and air conditioning equipment; Installation and replacement service for heating, ventilating and air conditioning systems; Installation, repair and maintenance of heating equipment; Maintenance and repair of heating installations; Plumbing and gas and water installation; Refrigerant recovery and abatement services, namely, removal of refrigerant from a system and placement of the refrigerant into a container; Refrigerator repair; Repair of household appliances and of residential heating, plumbing, air conditioning, and electrical systems; Repair or maintenance of gas water heaters; Technical consulting related to the installation of oil and gas equipment, control systems, and machinery