Double Pane Low E Windows U Factor

Window type u factor ratings.

Double pane low e windows u factor.

Some triple pane windows may have a u factor as low as 0 15. Fiberglass frames can be either hollow or filled with foam insulation. Consult specific manufacturers for nfrc rated u factors and shgcs for products of interest. Very hot sunny climates.

Double paned windows may have a u factor at or below 0 30. 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. Generally speaking windows all have a u factor between 1 3 and 2 and the lower the number the better.

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. A double pane glass is a term to describe the process of adhering two pieces of glass together to create a. Vinyl frames are low maintenance and provide good thermal insulation.

Low e glass is optimal for conserving energy because it reduces ultraviolet uv and infrared light penetration to limit heat transfer. Additionally the window selection tool compares average simulated energy costs for your location based on various window types. Energy star certified windows come in a variety of framing materials. Triple glazed windows may have a u factor as low as 0 15.

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. Good quality single pane window 1 0. Three panes of glass also available on select product lines for increased energy efficiency. Two panes of glass with sundefense low e protection and insulating argon between the panes.

Good single pane with storm window 6. Double pane with low e. Double glazed low solar gain low e glass. Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates.

The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient. 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. 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. The only exception to this rule are roof and skylight windows with low e smartsun glass which offer a u factor of 0 35.

Low e is a microscopically thin and virtually invisible coating that is applied to the side of glass that faces. Most windows now carry this rating so it s becoming easy to make comparisons. Sections may be hollow or filled with foam insulation. Blocks 95 of the sun s ultraviolet rays.

Old metal casement window 1 3. Gases are heavier than air and therefore provide insulation resistance to air.