Duncan Mechanical Heating & Air Conditioning has been providing Cape Girardeau and surrounding areas with excellent, prompt HVAC installation, service, and repair since 1994. Our commitment to quality has brought us lasting success in all of our customer segments; residential, commercial, and industrial. We offer top-notch work, reasonalbe prices, and a quick turnaround. Call today and see why we're Cape's most trusted HVAC professionals for over 18 years. Locally Owned & Operated - Free Estimates - Residential & Commercial - Servicing All Makes & Models