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A key advantage of wood construction is high thermal insulation. Wood has natural insulating properties that help moderate temperature within structures, making buildings more energy-efficient and comfortable. This is particularly important in climates with extreme temperatures, as it helps reduce heating and cooling costs.

While wood can indeed be cost-effective in construction due to its availability and the speed of building processes, the primary benefit related to sustainability and efficiency is its thermal insulation capability. This is crucial for maintaining energy performance standards and reducing environmental impact.

Other options such as unlimited span capabilities and excellent sound transmission do not accurately represent wood's characteristics; wood typically has limitations in span compared to materials like steel, and while it can provide some sound insulation, it does not excel in sound transmission reduction compared to other building materials designed specifically for acoustic performance.