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 h English (en)The building sector accounts for 23% of global energy-related {{CO2}} emissions. About half of the energy is used for space and [[water heating]]. Building insulation can reduce the primary energy demand significantly. [[Heat pump]] loads may also provide a flexible resource that can participate in [[demand response]] to integrate variable renewable resources into the grid. [[Solar water heating]] uses thermal energy directly. Sufficiency measures include moving to smaller houses when the needs of households change, mixed use of spaces and the collective use of devices. Planners and civil engineers can construct new buildings using [[passive solar building design]], [[low-energy building]], or [[zero-energy building]] techniques. In addition, it is possible to design buildings that are more energy-efficient to cool by using lighter-coloured, more reflective materials in the development of urban areas.