![]() Cold spots are drastically reduced, so there is little opportunity for convection currents to develop or for condensation to form. Under the same winter conditions with "Comfort-E" low-E glass, heat reflected by the glass warms the inside pane of the double-pane windows to about 56 degrees. The cold spot interacts with the warm air, setting up currents which cause cold drafts. Here is what happens: When it's 0 degrees outside and 70 degrees inside, the inside surface of the glass in a single-pane window is a very chilly 14 degrees! You feel a cold spot next to the window. Low-E Glass: A major cause of winter cold spots and drafts is window glass. They have a foam backing to prevent infiltration and weatherstripping to prevent air leakage at the meeting rails. This replaces the old weight and pulley system. Jambliner: The jambliner consists of a vinyl unit that has spring balances installed into it in order to balance the window sash in its operation. They come in different thicknesses, depending upon the application. They do not have a vacuum between the glass, but have either air or argon gas. Insulated Glass: This is two pieces of glass that are bonded together using aluminum, foam, or butyl spacers. ![]() The infiltration makes up 2/3 of the heat loss in a standard, single-pane window. Infiltration: This refers to the air that leaks around the sash and works its way into the weight pocket area in the wall. Hidden Balances: These are balances that are cut into the side of the sash and attach to the jamb so that they remain hidden from view at all times. ![]() A vinyl jambliner system replaces the old weight and pulley or friction balance system. Over time, this gas dissipates, losing its value.īi-Glass System: This is a window renovation system in which the single-pane glass is replaced with insulated glass, while retaining the original sash. This adds to the sound proofing of the window and to the insulation value. The gas is less dense than air and therefore transmits heat and sound at a slower rate. Argon Gas: This is an inert gas that is inserted into the space between the glass.
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