Limbach Holdings, Inc. engages in the provision of commercial specialty contractor services in the areas of heating, ventilation, air-conditioning (HVAC); plumbing; electrical and building controls for the design and construction of new and renovated buildings; maintenance services; energy retrofits; and equipment upgrades. It operates through Construction and Service segments. The Construction segment manages large construction or renovation projects that involve primarily HVAC, plumbing, or electrical services. The Service segment offers maintenance or service on HVAC, plumbing, or electrical systems. The company was founded in 1901 and is headquartered in Pittsburgh, PA.