A 3D-printed material with a built-in energy gradient can cool a building during the day and automatically stop it from freezing at night.

This programmable monolith uses a surface energy gradient to regulate temperature without any external power or sensors. It solves the biggest flaw in radiative cooling, which often causes objects to become dangerously cold after the sun goes down. The material releases latent heat at night to maintain a stable environment while providing maximum cooling during peak daylight. Passive cooling systems usually require expensive mechanical shutters or specialized coatings to achieve this balance. Using this tech in construction could drastically reduce the energy needed for air conditioning in desert climates. It turns the building itself into a smart, self-regulating thermal machine.