Cosmic, a California startup that builds tiny homes, wants to tackle two challenges at once: the housing shortage and carbon emissions. The company has designed an all-electric, net-zero tiny house that can generate at least as much energy as it uses each year. Cosmic uses a prefab design that can help lower costs and speed up construction by using standardized parts, though each home is customized for the buyer. The tiny houses start at 350 square feet and use built-in solar power and batteries. They also use a heat pump and store heat in a system with hot and cold water tanks that can provide heating and cooling on demand. The startup has built one prototype and will begin producing its first homes for sale this summer.