heat expense

例句：

1. 1. The heating system in this building is very efficient.
   这座建筑的供暖系统非常高效。
2. 2.The cost of installing new heating equipment is quite high.
   安装新供暖设备的花费相当高。
3. 3. The energy savings from using a more energy-efficient heating system are significant.
   使用更节能的加热系统可以节省大量能源。