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In climate zone 3, the required U-factor for a curtain wall is designated as 0.6. The U-factor measures the rate of heat transfer and is a crucial aspect in determining the energy efficiency of a building's exterior components, such as a curtain wall. A lower U-factor indicates better insulating properties, which is essential in maintaining comfortable indoor temperatures and reducing heating and cooling costs in a region that experiences varying climate conditions.

The 0.6 U-factor aligns with energy efficiency standards that aim to strike a balance between energy conservation and performance, ensuring that the structural and aesthetic aspects of the curtain wall do not sacrifice energy efficiency. Understanding the U-factor requirements for different climate zones helps contractors and builders make informed decisions about materials and techniques that will optimize energy performance and adhere to regulatory standards.

In climate zone 3, exceeding this U-factor would result in poorer performance and potentially higher energy costs, while meeting or being below this threshold supports sustainable building practices.