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。
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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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