Humber/Ontario Real Estate Course 4 Exam Practice

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Aside from the efficiency rating, what significantly impacts a window's energy efficiency?

Type of lintel installed
Division of sash into panes
How well the window is installed
Direction of casement window movement

The correct answer is: How well the window is installed

The installation quality of a window plays a crucial role in determining its overall energy efficiency. A well-installed window ensures proper sealing and minimizes air leaks, which can lead to significant energy loss. When a window is not installed correctly, gaps and misalignments can form, allowing drafts and moisture to penetrate, compromising the window's insulation properties. While the efficiency rating of a window gives an idea of its performance under ideal conditions, the effectiveness of that rating can only be realized with proper installation. Poor installation can negate the benefits of high-performance windows, regardless of their ratings. Other elements like the division of sash into panes can affect aesthetics and insulation, but they don't have as direct an impact on energy loss as installation quality does. The type of lintel and the operational method of a casement window are also relevant but are secondary to how effectively the window is fitted into its frame and sealed against the elements. This makes the quality of installation the most significant factor affecting a window’s energy efficiency after its inherent efficiency rating.