Grunau Company is a full-service mechanical systems contractor. Our professional staff designs, installs and services HVAC, plumbing, process piping, electrical, refrigeration, fire protection, and underground utilities for any size commercial and industrial project. Our Grunau Metals division designs and fabricates structural and specialty metals. Since 1920, Grunau’s name has been synonymous with a solid reputation, innovation, forward-thinking, creative solutions, customer focused, and built on values. Grunau is headquartered in Oak Creek, Wisconsin and has fire protection branches in Florida, Indiana, Ohio, and Pennsylvania.