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If you're going to go with new window sizes, then you can just re-frame the opening for the size windows you want. I would look for something in the same width, but just not as tall. That will limit the framing you have to do. My biggest concern would be making sure you can get similar siding to fill the voids on the outside. |
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3-lite slider: both end sashes slide left-to-right; center sash is fixed in place. Double-hung windows will be more weather tight, but your location and the fact this is under roof will negate that advantage. generally for a given space, a 3-lite slider should be more economical than a twin double-hung unit of the same size. |
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My suggestion is to DIY, and get nicer windows that you think. They aren't much more.
For example, the price difference from a basic window to a triple pane, ultra low-e, argon filled window was about $75/ea. Very much worth it when you consider the benefit in heating / cooling costs, and room temperature / feel. Difference between sliding doors for triple pane and low-e glass was $100/ea. I'm halfway through replacing the windows in my house from "decent but old" double pane windows to Pella 250 triple pane glass - and the room to room temperature difference is amazing with the new windows vs. old ones. |

