Double Pane Low E Windows U Factor

Double glazed low solar gain low e glass.

Double pane low e windows u factor.

A double pane glass is a term to describe the process of adhering two pieces of glass together to create a. Double pane clear and low e. Three panes of glass also available on select product lines for increased energy efficiency. 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.

Two panes of glass with sundefense low e protection and insulating argon between the panes. 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. Additionally the window selection tool compares average simulated energy costs for your location based on various window types. Blocks 94 of the sun s ultraviolet rays.

Good quality single pane window 1 0. Some triple pane windows may have a u factor as low as 0 15. Vinyl frames are low maintenance and provide good thermal insulation. Energy star provides recommended u factors for your climate.

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. Generally speaking windows all have a u factor between 1 3 and 2 and the lower the number the better. The best high performance double pane windows may have a u factor of 0 30 or lower indicating that they are very energy efficient. Fiberglass frames can be either hollow or filled with foam insulation.

This figure illustrates the characteristics of a typical double glazed window with a low solar gain low e glass with argon gas fill. Low e is a microscopically thin and virtually invisible coating that is applied to the side of glass that faces. Good single pane with storm window 6. Most windows now carry this rating so it s becoming easy to make comparisons.

Blocks 95 of the sun s ultraviolet rays. The only exception to this rule are roof and skylight windows with low e smartsun glass which offer a u factor of 0 35. Old metal casement window 1 3. Triple glazed windows may have a u factor as low as 0 15.

Gases are heavier than air and therefore provide insulation resistance to air. Consult specific manufacturers for nfrc rated u factors and shgcs for products of interest. Double paned windows may have a u factor at or below 0 30. Energy star certified windows come in a variety of framing materials.

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 glass is optimal for conserving energy because it reduces ultraviolet uv and infrared light penetration to limit heat transfer. Sections may be hollow or filled with foam insulation. Low u factors are most important in heating dominated climates although they are also beneficial in cooling dominated climates.

Very hot sunny climates. Double pane with low e.