In addition, it is very costly to heat the old hall in winter and cool it in summer.
而且，旧市政厅冬天采暖和夏天制冷都很花钱。
The new, larger building would be more energy efficient, costing less per square foot to heat and cool than the old hall.
新的更大的市政厅将会更加节能，单位面积所需的采暖和制冷费用都比旧建筑少。
The new, larger building would be more energy efficient, costing less per square foot to heat and cool than the old hall.
新的更大的市政厅将会更加节能，单位面积所需的采暖和制冷费用都比旧建筑少。
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