Hartwig Mechanical, Inc. is consistently recognized as one of the top plumbing, piping and HVAC contractors in Illinois and Wisconsin. Licensed, bonded, and insured, Hartwig performs projects of all sizes and scope. Since 1958, our expertise is managing a project from conception through design, construction, and maintenance of the facility or residence throughout its lifetime. Projects sizes range from $500K to over $15 million, and scopes range from elementary school maintenance to commercial facility projects. Description • Air conditioning • Heating • Plumbing • Commercial • Residential • Licensed • Insured • 24-hour Emergency Service • Dependable Speak with us at Hartwig Plumbing & Heating today to bid a project, schedule an appointment, or for immediate, emergency service.