A window air conditioner is a bulky, heavyweight box-like structure that has been there for decades. It marks the advent of air conditioners for Indian homes. A window air conditioner is an instant cooling system that cools down space instantly when the temperature outside is 43 degrees. It makes a lot of noise while the operations are on, and you may feel a little disturbed. A window AC is very simple and does not have too many design and color options. It is very affordable, but in the long term, the energy consumption is high.