Mountain Air Systems

Mountain Air Systems is a full-service HVAC and mechanical contractor that designs, installs and services heating, ventilation and cooling systems, along with custom mechanical systems for commercial buildings. The company's work includes a specialty welding division that fabricates carbon steel, stainless steel and aluminum piping, with welders certified for gas piping, high-pressure steam and medical gas lines. Its past projects include work for Middlebury College and the Switchback Brewery.

The company serves customers across Vermont and parts of New Hampshire and New York, and its service division handles maintenance for systems it installed as well as those put in by other contractors. Customers can get a guaranteed, fixed-cost preventative maintenance agreement after an initial system evaluation. The office is at 430 Commerce Street in Williston, Vermont.