If above fault has been ruled out, air conditioner still cooling, heating effect is poor, then can judge compressor failure or low efficiency.
若以上故障已排除，空调器仍然制冷、制热效果差，则可判断压缩机失效或效率降低。
Points out that direct electricity heating is of low energy efficiency, but it can be a supplement to other heating modes or for spot heating in buildings.
指出电直接供热是能源的低效应用，但可以作为其他供热方式的补充或用于建筑局部供热。
Low efficiency and high costs generally exist in heating system, being operated in big and moderate cities, which relates to design, operation and management.
我国大、中城市现已运行的供热系统，普遍存在着热效率低、供热成本高的缺点。其原因有设计方面的，也有运行管理方面的。
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