CAC

例句：

1. 1. The new building has a central air conditioning system installed.
   这座新建筑安装了中央空调系统。
2. 2.The heating system in the house is efficient, keeping us warm during winter.
   家里的供暖系统效率高，冬天让我们感到温暖。
3. 3.Central air conditioning systems are essential for maintaining comfortable indoor temperatures.
   中央空调系统对于保持室内温度舒适至关重要。