Keeping out the winter chill… and staying cool inside when outdoor temperatures rise… insulation maintains conditions at the right temperature and humidity both for human comfort and safe operation of equipment. Insulation workers install and replace insulation materials for buildings and mechanical systems – to balance temperatures and save on energy. These workers remove old insulation and safely dispose of it. Using blueprints to guide their work, they use math skills to figure out the insulation needed, and to measure and cut it accurately. Insulation workers are skilled with both power and manual tools for cutting materials, welding fittings and stapling insulation in place. They work full time, spending much of the day on their feet, bending, or kneeling in confined spaces. When needed, they wear suits, masks, and respirators to protect against hazards. There are two types of insulation workers: Floor, ceiling, and wall insulators install insulation indoors— in attics, under floors, and behind walls in homes and other buildings. Most work for drywall and insulation contractors. These workers learn on the job— no formal education is required. Mechanical insulators apply insulation both indoors and outdoors to equipment, pipes, or duct work at commercial buildings. Most work for building equipment contractors, or drywall and insulation contractors. Mechanical insulation workers typically complete a 4-year apprenticeship after earning a high school diploma or equivalent.