A mechanical contractor is a professional who oversees mechanical projects for organizations, including the heating or cooling systems, refrigeration, piping, and plumbing of a building. They are responsible for installing, maintaining, and repairing mechanical systems, including HVAC, plumbing, piping, refrigeration, and more. Mechanical contractors work in a supervisory role where they oversee projects and work with other mechanical workers to ensure the projects run smoothly. They may hire subcontractors who are specialists in their field to complete specific tasks. Mechanical contractors can work on a wide variety of different projects in many other trades, including large-scale plumbing, HVAC, electrical, piping, ductwork, and gas work. They can also take care of system maintenance and repairs once installed. Mechanical construction is a dynamic industry, and projects come in all shapes and sizes, from small residential homes to large-scale commercial buildings.