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We are Minnesota's premier sheet metal fabricator, custom designing and building ventilation systems to exact specifications, and also offering design/build services for new and retrofit construction projects in the commercial, residential and industrial markets.

Minnesota's premier sheet metal fabricator, and design/build service.

From local businesses and small offices to large organizations like hospitals, schools and manufacturing facilities, we have proven time after time that we get the job done. We work extensively with architects, designers and engineers early in the building and planning process to lend our expertise and help determine the most efficient HVAC solution for your organization.

From Design/Spec to Plan/Build...we’ve done it, and we do it efficiently and effectively. We've aligned ourselves with the highest quality brands in the market. Successful relationships with companies like Lennox®, Carrier®, and Trane® have proven to deliver value to the customers we serve. While many companies may offer similar products and services, few support them with the level of experience, commitment and service that Thelen delivers.

Commercial Contract

Located in the Brainerd lakes area, Thelen Heating and Roofing Inc. is Minnesota’s premier single source provider of Commercial Roofing, Heating, Cooling and Ventilation Systems for residential and commercial customers.