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When selecting IGUs, it's important to consider factors such as the type of insulating gas used, the thickness of the glass panes, and the overall quality of the window framebuy insulated glass unit. High-quality IGUs typically use argon or krypton gas, which have better insulating properties than air. The thickness of the glass panes can also vary, with thicker panes offering better insulation but potentially increasing the cost. Additionally, the window frame should be made from durable materials such as vinyl or aluminum, which are resistant to warping, fading, and corrosion.