Voltas ac I have been using last 5 year.is the best cooling in my room.my room size is 11*13 but this ac covring lobhi also.so that I have to swittch of after few times.means I m not using full night.hardly m use only 1 hours a night.i m 100% satisfied with my ac voltas.eletricity is minimus consume.whenever you buy something it is not sufficient that the product runs and looks good.my overall review regarding voltas one of the best ac.thanx