Double Pane Low E Windows U Factor

Most windows now carry this rating so it s becoming easy to make comparisons.

Double pane low e windows u factor.

Triple glazed windows may have a u factor as low as 0 15. Double paned windows may have a u factor at or below 0 30. Old metal casement window 1 3. Some triple pane windows may have a u factor as low as 0 15.

The only exception to this rule are roof and skylight windows with low e smartsun glass which offer a u factor of 0 35. Sections may be hollow or filled with foam insulation. Fiberglass frames can be either hollow or filled with foam insulation. Very hot sunny climates.

For most energy efficient windows the u factor for the entire window assembly is higher than the u factor at the center of the glass. Low e is a microscopically thin and virtually invisible coating that is applied to the side of glass that faces. Double pane clear and low e. Double pane with low e.

This figure illustrates the characteristics of a typical double glazed window with a low solar gain low e glass with argon gas fill. Fiberglass frames are strong durable low maintenance and provide good insulation. Three panes of glass also available on select product lines for increased energy efficiency. The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient.

Double pane dual pane glass naturally performs better than single pane glass for energy efficiency as the space between each pane acts as an additional layer of insulation from the heat or cold. Energy star provides recommended u factors for your climate. High performance double pane windows can have u factors of 0 30 or lower while some triple pane windows can achieve u factors as low as 0 15. Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates.

Blocks 94 of the sun s ultraviolet rays. Good single pane with storm window 6. Energy star certified windows come in a variety of framing materials. Additionally the window selection tool compares average simulated energy costs for your location based on various window types.

Low e smartsun windows and doors feature the best heat insulation of all andersen products with u factors ranging from 0 24 to 0 25. Generally speaking windows all have a u factor between 1 3 and 2 and the lower the number the better. Consult specific manufacturers for nfrc rated u factors and shgcs for products of interest. Two panes of glass with sundefense low e protection and insulating argon between the panes.

Gases are heavier than air and therefore provide insulation resistance to air. A double pane glass is a term to describe the process of adhering two pieces of glass together to create a. Low e glass is optimal for conserving energy because it reduces ultraviolet uv and infrared light penetration to limit heat transfer. Vinyl frames are low maintenance and provide good thermal insulation.

The u factor will approach the very low 0 15 point if there is a gas such as argon or krypton between the layers of glass glazing. Blocks 95 of the sun s ultraviolet rays.