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Posted By

O. Kheir (Phoenix, AZ)

Category

Windows & Doors

Posted Date

1/18/2019 12:00:00 AM

Forum Title

Heat buildup behind closed-off window?

I would like to mostly close off a large (70 x 58), south-facing window in our home in the high desert of northern Nevada. I would be mounting 1/8 hardboard across the top 36 of the window to 2x lumber extending horizontally across the window. There would therefore be 1 1/2 gaps along the vertical edges of the window where air could circulate. There is an existing Levolor cellular shade that I would like to leave as insulation. I would like to add additional insulation, if it can be done without incurring moisture buildup. The bottom 20 or so of the window will be accessible; it's a horizontal slider, so I should be able to open it if need be, for ventilation. There is a concern that in such a situation that, say, on a summer day, heat could build up to a dangerous level between the hardboard and the window. Is that possible? Thanks, Jeff
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