Usually we put air conditioning units when the sun beats down on our homes and heating up the indoor environment. This heating happens due to the vast amounts of energy given off by the sun, which are then transmitted through absorption and convection.
We are all familiar with this process, and those of us who live in hotter climates spend significant time and money on technology and house design that can minimize its effects.
With so much energy being absorbed by your building, it makes a lot of sense to harness it to cool the inside environment. This may seem like a novel idea, but in fact, solar-powered air conditioning is a growing market that may soon rival electric-powered air conditioning.