About us From the first day we opened our doors for business, A to Z Heating & Cooling was founded with the idea of putting our customers' needs first. We pride ourselves on providing the best products and service to our customers. Customer satisfaction is our #1 priority. Whether you're in need of a new system or a tune-up, our dedicated technicians are ready to help. We stay up to date on the latest trends and qualifications in the industry ensuring that our team is qualified for the job. No matter what your heating or cooling needs are you can count on A to Z Heating & Cooling to help. Call us today at (313) 291-8200.