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MSI was incorporated as in March of 1972 as a merger of two of the Galesburg area’s most prominent mechanical contractors, Stigner Plumbing & Heating, Inc. and John R. Holt, Inc. Since then, MSI has become synonymous with tremendous service and quality craftsmanship for a fair price.
As time went on, MSI expanded to service the Peoria area and has thrived in that market as well. In June of 2013, MSI purchased Du-Mont Company in Peoria and has transformed the operation into on
MSI's corporate offices are located less than a mile southwest from downtown Galesburg on Monmouth Boulevard, approximately a quarter mile from the Henderson Street/Monmouth Boulevard junction.