Mr. Richie Mittal is Managing Director, Overdrive Engineering Pvt. Ltd., dealing in Energy Efficient Design, IAQ and Geothermal for Energy Audit, Green Building, etc. Mr. Richie, ME in Thermal, has 4 decades of experience in the AC industry and is Guest lecturer in Engineering Colleges including IIT, Delhi. Engaged in various capacities, he was National Past President of ISHRAE; Director & Regional Chair at ASHRAE; Past Member Board of Director – IAQ Association Inc (USA) and Founder Member – International Ground Source Heat Pump Association (USA)- India Chapter IGSHPA and was technical advisor GRIHA and TERI.