Energy self-sufficiency is only the first layer of true independence. Complete autarky means the house functions as a protective shell for its occupants – securing not just electricity, but also heating, cooling, and potable water, even when external infrastructure fails. Resilience is the ability to bridge supply outages seamlessly without sacrificing comfort. In this section, we examine the design principles of a robust home: backup power sources, the building's thermal inertia, water storage, and automated crisis-mode controls. Rational engineering instead of dependence on systems beyond our control.