Double Pane Low E Windows U Factor

Triple glazed windows may have a u factor as low as 0 15.

Double pane low e windows u factor.

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. Old metal casement window 1 3. Fiberglass frames are strong durable low maintenance and provide good insulation. Double pane clear and low e.

Some triple pane windows may have a u factor as low as 0 15. Three panes of glass also available on select product lines for increased energy efficiency. Gases are heavier than air and therefore provide insulation resistance to air. Vinyl frames are low maintenance and provide good thermal insulation.

Energy star certified windows come in a variety of framing materials. Sections may be hollow or filled with foam insulation. Generally speaking windows all have a u factor between 1 3 and 2 and the lower the number the better. 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 glazed low solar gain low e glass. Double pane with low e. Low e glass is optimal for conserving energy because it reduces ultraviolet uv and infrared light penetration to limit heat transfer. Window type u factor ratings.

Good quality single pane window 1 0. Two panes of glass with sundefense low e protection and insulating argon between the panes. Low e is a microscopically thin and virtually invisible coating that is applied to the side of glass that faces. 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. Very hot sunny climates. 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. A double pane glass is a term to describe the process of adhering two pieces of glass together to create a.

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

Good single pane with storm window 6. Fiberglass frames can be either 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. Most windows now carry this rating so it s becoming easy to make comparisons.

Blocks 95 of the sun s ultraviolet rays. 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.