Your questions answered: HVAC FAQs. Dial One Mears Air Conditioning & Heating Inc in Phoenix can answer all your HVAC-related questions. Before you get on the phone, check to see if we already responded to your question online. If you don’t see your question in this list or want more information on a topic, give us a call at 602-997-5701. Our experts can give you the information you’re looking for in a jiffy.