It may seem contradictory, but soon you may be able to cool your home with sunlight. Israeli company SolCold has developed a high-tech paint based on a process called 'laser cooling' to offset the cost – economically and environmentally – of using air conditioning in hot summer months.
Laser cooling is the process by which hitting specially designed materials with a laser can cool them by up to 150ºC. The molecules in these materials "absorb photons whose light is of one frequency while spontaneously re-emitting higher-frequency photons, which also carry more energy," according to New Scientist. Since energy is lost in this exchange, the temperature of the material goes down.
Sunlight isn't as powerful as a laser, but Yaron Shenhav of SolCold decided to see if he could adapt this laser cooling process so it worked with the sun.