HITACHI PTAC HVAC SERVICES INC. We offer 24/7 Air Conditioning Repair, Installation, Maintenance, sales services and will get you cool in no time. Equipped with the latest technologies in the field, you can count on our expert technicians to diagnose and identify the problem quickly and accurately. We are New York’s leading PTAC repair providers, helping every restaurant office and home breathe fresh. With almost 10+ years of experience serving the residents of New York and Surrounding Areas.