Air-conditioning is the name of the scientific method that defies unruly sun, freezing winters and humid airs. Once a sci-fi author Rober Heinklein had said “Climate is what you expect, weather is what you get.” Truly, with air-conditioner we get what we expect.  What we know as air conditioning is rather an innovative and as unique technology, but for ages, different techniques of dehumidifying and cooling air have always been around and practiced in different parts of the world. The seeds of this thoughtful invention called air-conditioner were sown ages back when handmade fans gave way to electric fans and coolers and finally the 21st century woke up to the AC that marked the onset of temperature ruled by man.