These spring-operated balancing mechanisms also typically permit the top of the windows to swing inward, permitting cleaning of the exterior of the IG window from inside the building. Modern window units with IG typically completely replace the older double-hung unit, and include other improvements such as better sealing between the upper and lower windows, and spring-operated weight balancing that removes the need for large hanging weights inside the wall next to the windows, allowing for more insulation around the window and reducing air leakage, provides robust protection against the sun and will keep the house cool in the hot summer and warm in winter. It is possible to retrofit insulated glazing into traditional double-hung frames, though this would require significant modification to the wood framed due to the increased thickness of the IG assembly. Screens may also be left installed year-round with insulated glazing, and can be installed in a manner that permits installation and removal from inside the building, eliminating the requirement to climb up the exterior of the house to service the windows. Insulated glazing forms a very compact multi-layer sandwich of air and glass, which eliminates the need for storm windows. This eliminates the need for changing the entire storm window according to the seasons. However, current reproductions of these old-style storm windows can be made with detachable glass in the bottom pane that can be replaced with a detachable screen when desired. The weight of the large storm window frame and glass makes replacement on upper-stories of tall buildings a difficult task requiring repeatedly climbing a ladder with each window and trying to hold the window in place while securing retaining clips around the edges. Traditional storm windows and screens are relatively time-consuming and labor-intensive, requiring removal and storage of the storm windows in the spring, and reinstallation in the fall and storage of the screens. No screening was usually possible with open storm windows, though in the winter, insects typically are not active. To permit ventilation the storm window may be hung from removable hinge loops and swung open using folding metal arms.
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