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 So opening windows at the top and opening the windows at the bottom will create a chimney effect — cool air being sucked in and hot air leaving through the topRenewal by Andersen® picture windows are an excellent choice for letting in light from hard to reach spaces, like high walls in a vaulted room A combination of picture window with operable replacement window adds functional element to the aesthetic one Pair a casement window on either side to increase ventilation, combine different sizedThe top opening of the window was designed to let heat out of the structure it's installed in, while the bottom half was designed to let in cooler air because heat while cooler air tend to stay at the bottom during warmer periods of the year If you any windows installed the upper portions of a structure, and want to cool it down a bit Topwindow Side Hung Top Hung Fixed Sliding Folding Casement Custom Single Hung Luxury Upvc Windows Buy Upvc Windows Art Craft Luxury Upvc Windows Pvc Windows P