——北方采暖地区既有居住建筑供热计量及节能改造工作已经启动。
Heat metering and energy efficiency renovations on existing residential heating system in North China.
在北方采暖地区重点城市进行试点，积累了经验，正在稳步推进。
Key cities in the northern region for heating pilot, and accumulated experience, is steadily moving forward.
文摘：目前我国北方一些地区的一幢建筑物常有空调和采暖两套系统。
Abstract: at present, a quantity of buildings in some north region of our country have both air conditioning system and traditional heating system.
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