This tool lets you visualize the degree to which a horizontal overhang or roof shades a window throughout the year, and it also calculates the effect of the overhang on solar heat gain. Please read the important instructions, notes, and FAQ pages before using this tool.
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The author maintains a private mailing list of users of the SunAngle suite of solar design tools, and is happy to send you very occasional notices about software upgrades and other items of interest. Such notices do not typically occur more frequently than a few times a year.