Limbach Holdings, Inc. provides commercial specialty contract services in the United States. It operates in two segments, Construction and Service. The company provides services in the areas of heating, ventilation, air-conditioning (HVAC), plumbing, electrical, and building controls through the design and construction of new and renovated buildings; maintenance services; and equipment upgrades. Its facility services comprise mechanical construction, HVAC service and maintenance, energy audits and retrofits, engineering and design build, constructability evaluation, equipment and materials selection, prefabrication of mechanical systems and components, and sustainable building solutions and practices. The company serves healthcare facilities; public and private colleges, universities, research centers and K-12 facilities; sports arenas; entertainment facilities, including casinos, and amusement rides; passenger terminals and maintenance facilities for rail and airports; government faci