An insulator, also known as an insulation worker, installs, maintains, and repairs insulation materials in buildings and mechanical systems to regulate temperature, reduce energy costs, and improve comfort. They work with various materials like fiberglass, foam, and cellulose, using tools to cut, fit, and secure insulation in place, often in challenging environments. According to ZipRecruiter, their duties include reading blueprints, taking measurements, and ensuring safety while working with potentially hazardous materials.