You can easily check if your window is double-pane by performing the fingernail reflection test or inspecting the spacer bar. If you hold the tip of your finger or a small light up against the glass pane, a double-pane window will produce two distinct pairs of reflections, whereas a single pane shows only one. Additionally, looking closely at the edges where the two panes meet reveals a metal or foam spacer bar sealing the inner cavity.
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