建筑节能应该包括围护结构节能和系统节能两大领域。围护结构节能是指改善围护结构的性能，减少能源的消耗，使得供给建筑物的能源在建筑物内部有效利用，而不是通过建筑物的围护结构损失掉；系统节能是指向建筑物供给能源的系统，在能源供给的过程中提高效率，而不是在能源的 Building energy efficiency should include the two major areas of energy conservation of building envelope and system energy conservation. Enclosure energy saving means improving the performance of the envelope structure and reducing the energy consumption, so that the energy for the building is effectively used inside the building instead of being lost through the building envelope; the energy saving of the system is to supply the building Energy systems increase efficiency in the energy supply process, not in energy