Your Hardworking Local HVAC ContractorOver 40 years ago, Don Magnuson founded Magnuson Sheet Metal Inc. Magnuson Sheet Metal is now operated by long time employee, Craig Aurand. Since then, weve grown into a full-service HVAC contractor and sheet metal fabricator. Our factory-trained and certified technicians are ready to help with all your residential or commercial HVAC system needs. Call us when you have a boiler, furnace, HVAC or sheet metal need in Willmar or the surrounding area.