I purchased votas vertis plus ac on 26 june 2009 from sargam electronics pitam pura delhi after a few days it started making loud bang bang noise and we complained to the voltas service centre who checked the same several times even took the machine to the service centre but the problem never solved. the ac is out of use and i feel cheated by the VOLTAS COMPANY .i think this model has some manufacturing defect. and need replacement. modelno4010902 vertis plus 1.00 ton