Royal Windows & Doors

1) What is Low-E Glass?
Low-E Glass is clear glass with a thin, transparent metal-oxide coating which helps block the transfer of radiant heat. This results in a window that can keep any home, in any location, warmer in winter and cooler in summer.

2) What does "Low-E" mean?
Low-E stands for low-emissivity. Emissivity is a measure of how much a glass surface transfers radiant heat. The less radiant heat is transferred, the better.

3) What is radiant heat?
The sun radiates energy, which is received in shortwave rays that provide visible light. When the sun shines directly through your windows, shortwave rays enter your home, strike objects like the floor, walls and furniture, and warm them. These sun-warmed objects then re-radiate long-wave rays of invisible infrared heat. Likewise, long-wave radiant heat is provided within the home from other sources such as heating systems, fireplaces, light bulbs, appliances and even our warm bodies.


				First, the special coating on Low-E Glass is designed to easily transmit the sun's shortwave energy because it is transparent to that range of radiation. So it allows most of the sun's energy in through your windows, which helps heat your home in winter
				Second, once the heat is inside your home and has been converted to long-wave radiant heat, the coating works to reduce the amount of heat that is absorbed by the glass and the amount of heat that is transferred through the glass, by minimizing the emission of long-wave radiation. Since Low-E Glass does not
		absorb as much heat, that long-wave heat and the heat generated by your furnace, cannot be transferred back to the outside of your house through the glass in winter. Instead, the coating is specially designed to increase the insulating value of the glass.


				Low-emittance (Low-E) coatings are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a glazing surface primarily to reduce the U-factor by suppressing radioactive heat flow. The principal mechanism of heat transfer in multilayer glazing is thermal radiation from a warm pane of glass to a cooler pane.
		Coating a glass surface with a low-emittance material and placing that coating between the glass layers blocks a major amount of this this radiant heat transfer, thus lowering the total heat flow through the window. The benefits are a cooler home in the summer and a warmer home in the winter. Modern Low E glass senses summer by the angle of the sun in the sky and acts much like a heat mirror, keeping heat and damaging sunrays out. In the summer this helps to keep your house cooler, as the heat from objects outside is kept outside. In the winter, Low E reverses the process and heat is reflected back into your house by the low-E glass.

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