If you're looking for an established, reliable Heating, Ventilation and Air Conditioning contractor in the Chicagoland area, you've come to the right place. Licensed and fully insured, Mel-O-Air offers a complete installation and service department. Our experienced professionals are trained in residential, commercial and light industrial equipment. Mel-O-Air has been in the HVAC business for nearly 50 years. We offer 24 hour around-the-clock service, with 14 radio-dispatched trucks standing by to meet your needs anytime, anywhere in greater DuPage County.