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Proudly Serving the Metro East Area Having served Southern Illinois since 1964, Amsco Mechanical, Inc. is one of the oldest mechanical contractors based in the Metro-East area. We’ve been the proven solution for area contractors and organizations in need of commercial, industrial, and institutional services, including: Plumbing HVAC Piping Design and Build  Plan and Spec Professional Affiliations Union Affiliated Contractors (UAC) Plumbing, Heating and Cooling Contractors Association (PHCC) Great South West PHCC (GSWPHCC)