Voltas 1.5 Ton 3 Star Window AC (Copper, 183CYA/183 CZP, White) Voltas y-series vertis classic window air conditioner ensures instant cooling. Highest energy efficient rotary compressor enables minimum power consumption, higher cooling efficiency and quiet operation. Multi-bend heat exchangers that increase the heat exchange surface area and thus improve efficiency. Trapeziform inner-grooved copper tubes allows adequate refrigerant flow, improves the heat exchange efficiency and lowers power consumption. High efficiency design allows the machine to perform at its best. The pg no grade speed control motor is not affected by voltage fluctuations and this avoids the noise caused by the motor. The new golden optimised wind flow design lets the air flow smoothly and lowers the noise down to minimum. Each pipe is bent using an imported automatic three dimensional bending machine at one go. This reduces the welding knots, noise caused by box resonance and also avoids deformation. Each pipe is bent using an imported automatic three dimensional bending machine at one go. This reduces the welding knots, noise caused by box resonance and also avoids deformation. Its features include silver nano anti dust filters, auto restart, easily removable panel, fresh air ventilation, lcd remote, large led display, turbo mode, auto swing, timer, sleep mode, memory function, glow light button, and self diagnosis.