Electricity carried through an immense web of copper eventually makes its way into our homes, providing the endless supply we need for temperature control. It’s expensive, and in some places the air conditioning can easily account for half the electricity bill. Paying this upkeep could even make the difference between life and death in extreme climates. Thankfully, there are other options out there. Using alternative building techniques, houses can be designed that passively heat and cool themselves all year long – without electricity!