Most of us think we're fighting the hot air outside, but the real enemy is sitting right on top of your house: your roof. In this video, we dive into the science of "Solar Loading" and how a typical dark roof absorbs 95% of the sun's energy, turning your attic into a giant oven.

We're going back 3,500 years to rediscover an ancient Minoan secret that scientists at Purdue University recently confirmed is more powerful than modern central air. For less than $50, you can use the physics of "Radiative Sky Cooling" to dump heat into the vacuum of space.