Building envelope energy efficiency3/23/2023 The high-performance envelope of a ZEH results in much lower space heating and cooling loads relative to current housing and also makes the house sufficiently air-tight to require mechanical ventilation for indoor air quality. In contrast, for the particular prototype ZEH structures used in the analyses in this report, that ratio ranges from about 0.3:1 to 1.6:1 depending more ยป on location. By reducing total building energy use and improving energy efficiency, envelope research and development (R&D) will have a significant impact on how low-carbon buildings can mitigate climate = 12% for water heating (about a 3.6:1 ratio). buildings is critical to achieving aggressive cli- mate goals that support a clean energy economy and an equitable energy future for all Americans. Improving the energy performance of the opaque envelope in U.S. Building envelope performance is also important for occupant comfort, productivity, health, and well-being. Retrofits are particularly crucial to realizing the energy savings potential of the opaque envelope because nearly 85% of residential and 55% of commercial buildings that exist today will still exist in 2050. High-performance opaque envelope technologies, therefore, have substantial potential to reduce energy use in both new construction and existing buildings. The opaque envelope affects 25% of building energy use, or 10% of total U.S. Residential and commercial buildings comprise 39% of total U.S. The opaque envelope - the barrier that helps maintain comfortable indoor conditions regardless of prevailing outdoor conditions - is the single largest contributor to primary energy use in residential and commercial buildings.
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