既有建筑节能改造,是当前和今后一段时期建筑节能工作的重要内容。对既有建筑实施节能改造,全面推进建筑节能工作,不仅是降低能耗、节约能源、实现节能目标的需要,也是减少污染、改善环境、实现可持续发展的必然要求。 The existing building energy-saving renovation is an important part of building energy conservation work for the present and future period. Carrying out energy-saving retrofit on existing buildings and comprehensively promoting energy conservation in buildings are not only the need of reducing energy consumption, saving energy and meeting the energy-saving goals, but also the inevitable requirements of reducing pollution, improving environment and realizing sustainable development.