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Ines Hegedus-Garcia 23rd September, 2009

Ethan, I need more information to be able to help you - the year and style of the house would help as well as location and exterior materials. Double hungs were used by a variety of styles and if you have lights, then it's usually colonial (the actual lights are square). The best bet if for you to try to get the original plans for the house to see what the architect intentions were - if you are changing the size of the opening, then all bets are off.

The overall look of the window should be a rectangular (up and down) - broken up into 2 squares and then those broken up into other smaller squares (vitruvian proportions at its best).