GSM - New Ulm | New Ulm, MN

GSM - New Ulm in New Ulm, MN is a family-owned roofing, HVAC, and plumbing contractor serving southern Minnesota and nearby states since 1904. They provide residential and commercial work, and they offer 24-hour emergency heating, cooling, and refrigeration service for urgent situations.

Business Overview

GSM - New Ulm employs experienced installers and service technicians. Their crews handle small home repairs and large commercial projects. The company works with homeowners, businesses, and property managers. Emergency calls are routed to on-call technicians so heating and refrigeration issues get prompt attention during cold winters or peak summer heat.

Key Services

Services are grouped to make it easy to find help:

• Roofing: roof inspection, new roof installation, roof repair, roof replacement, commercial flat roofing, gutter cleaning.
• HVAC & Refrigeration: HVAC installation or replacement, HVAC repair, system maintenance, geothermal systems, 24-hour refrigeration service.
• Plumbing & Fixtures: plumbing inspection, installation and repair of sinks, toilets, tubs, showers, faucets, drains, water heaters, water pipes, sewer work, garbage disposal, and gas line service.

Areas Served

GSM - New Ulm serves communities across southern Minnesota and nearby Iowa, including:

Mankato, Hutchinson, Marshall, North Mankato, New Ulm, Worthington, Saint Peter, Glencoe, Morris, Montevideo, Redwood Falls, Luverne, Saint James, Windom, Le Sueur, Sleepy Eye, Benson, Jackson, Blue Earth, Watab, Eagle Lake, Franklin, Granite Falls, Glenwood, Lake Crystal, Olivia, Saint Wendel, Madelia, Wells, Gaylord, Arlington, Dovre, Twin Lakes, Mountain Lake, Tracy, Springfield, Fish Lake, Slayton, Mapleton, South Bend, Lakefield, Sand Creek, Florence, Madison, Dawson, Starbuck, Winnebago, Appleton, Clara City, Minneota, Fulda, Winthrop, Renville, Edgerton, Fairfax, Adrian, Cottonwood, Nicollet, Tyler, Atwater, Truman, Sherburn, Sheldon IA, Sibley IA, Rock Rapids IA, Lake Mills IA, Hartley IA, Sanborn IA, Arnolds Park IA, Saint Ansgar IA, Lake Park IA.

Company History

Founded in 1904 as Gag Sheet Metal, the company has remained in the same family for generations. Ownership passed from George Gag to Melvin, then to Mike, and today John Gag leads the business. Over more than a century, GSM - New Ulm expanded from sheet metal work to include full-service roofing, HVAC, plumbing, and appliances.

Leadership

Under John Gag, GSM keeps a local presence with hands-on leadership. Technicians receive ongoing training and the company maintains ties with suppliers and municipal partners around New Ulm. Staff take part in local events and support community projects tied to housing and commercial development.

Specialties & Highlights

• Commercial flat roofing expertise for businesses and public buildings.
• 24-hour emergency heating, cooling, and refrigeration response.
• Generational, family-owned business with deep local knowledge.
• Combined services—roofing, HVAC, plumbing—reduce coordination time on remodels and repairs.

Why Locals Choose GSM - New Ulm

Residents and businesses in New Ulm, MN choose GSM - New Ulm for reliable tradespeople and long experience in the region’s extremes—cold winters and humid summers. Their history, local staff, and multi-trade capability make project planning easier for homeowners and property managers alike.

Contact GSM - New Ulm for service inquiries, estimates, or emergency response in New Ulm and the surrounding communities.