O-ZONE HEATING & COOLING serves as a leading Heating and Air Conditioning Contracting Firm in the Chicagoland area. We’re a team of fully-certified professionals who tackle everything from complex large projects to smaller scale jobs. Fueled by our commitment to excellence, we go the extra mile to make sure clients are completely satisfied with our work. Call us today to schedule a consultation. Quality service at a fair price. We are licensed, bonded and insured.