Harnessing cross-ventilation is a powerful and energy-efficient way to cool a room. Here's how I do it and keep air conditioning use to a minimum.

The natural alternative, cross-ventilation, is widely regarded as the most energy-efficient and sustainable way to keep your home's air constantly circulating.

If you want to use natural ventilation for cooling, the outside air must be colder than the indoor air. For example, I close my windows and rely on my AC after the outdoor temperature tops 75ºF.