Windows make up 7% of the envelope area of a home but can account for 47% of the envelope heat loss. High-performance windows thus represent a significant opportunity for consumers to be more comfortable and save money – and help reduce energy demand and greenhouse gas emissions while doing so.
Buildings account for a whopping 40% of total U.S. energy consumption, and windows are responsible for approximately 10% of that. High thermal performance windows reduce combined heating and cooling energy consumption of typical single family homes in California by up to 50% compared to existing single-pane windows, which are still found in 6.5 million, or
A study by scientists at Berkeley Lab modeled several different types and ages of homes, retail stores, and office buildings in cities across California and the U.S. and found that sunlight-reflecting “cool” exterior walls can save as much or more energy than sunlight-reflecting cool roofs in many places.
Berkeley Lab indoor air experts Brett Singer and Woody Delp advise: stay indoors, consider a mask, limit activities, use air filtration systems, or even build your own.
A national online energy data management system is transforming how energy retrofit projects implemented by a wide variety of users – including local, state, and federal governments – develop projects and track performance.
About $20 billion worth of energy leaks out of windows in the United States each winter – and that’s with double-paned insulating windows installed on a majority of buildings. Lawrence Berkeley National Laboratory is now working with manufacturers to bring to market a “super window” that is at least twice as insulating as 99 percent of the windows for sale today and will be ready to achieve mass-market status.
A photovoltaic glass that is also reversibly thermochromic is a green technology researchers have long worked toward, and now, scientists at Lawrence Berkeley National Laboratory have demonstrated a way to make it work.
By using advanced lighting and automated shades, Berkeley Lab scientists found that occupants on one floor of a high-rise office building in New York City were able to reduce lighting energy usage by nearly 80 percent in some areas. The dramatic results emerged at a “living laboratory” set up to test four sets of technologies on one 40,000 square-foot floor of a building.
The knowledge and expertise of a seasoned energy efficiency professional has been packed into a high-tech suitcase. The Sensor Suitcase is a portable case that contains easy-to-use sensors and other equipment that make it possible for anyone to identify energy-saving opportunities in small commercial buildings.
California has established ambitious goals to reduce energy consumption in buildings, including a policy goal for all new residential buildings to be zero net energy (ZNE) by 2020. Now Berkeley Lab has launched two projects to help the state meet its ZNE building goals.