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A G-value measures the transmittance of solar gain through glazing and windows – how much heat is transmitted through glass from the sun’s rays. Our guide explains why this matters when you are choosing windows and glazing.

The G Value for windows, also known as the solar heat gain coefficient (SHGC), is a measure of how much solar energy (heat) a window lets into a building. It is expressed as a number between 0 and 1, with a lower G Value indicating less heat transfer and a higher G Value indicating more.

As presented, g-value of IGU is an important characteristic and should be considered when installing windows in different regions and even different sides of buildings to get an optimal combination of insulation and solar gains and to avoid intensive overheating of inner spaces.

Jan 18, 2018 · The ‘g’ factor (or G-value) is the coefficient most commonly used by window manufacturers to measure a window’s ability to transmit solar energy.

Efficient Windows. Replacing your home’s windows with ENERGY STAR ® qualified windows will improve indoor comfort and filter out damaging ultraviolet light, while potentially saving you hundreds of dollars a year on heating and cooling costs. Replacing Old Windows. Traditional window materials used . in houses across the United States

The best way and most relevant to your project is when the manufacturer is able to work out the precise value of the exact windows you would be ordering. The value is based on every individual part of the window: the insulation of the frame and the glass; the precise area and shape of the frame and the glass; and the spacer bar inside the glass.

When choosing your windows, make sure you evaluate the window ratings to ensure you have the most energy-efficient windows possible. Based on your climate, make sure you have the proper U-Factor. For SHGC, consider having a lower rating if you live in a warmer area.

** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness) For higher g-values please refer to our Thermal Insulation glass product range For thicknesses other than above calculate using Pilkington Spectrum

Oct 27, 2023 · In short, the g-value is used to indicate how much solar heat or solar energy is coming in through your window. The higher the number, the more solar energy is coming in. The g-value therefore provides information about how much heat your window adds to your home. This can be beneficial if you want a home that is more energy efficient.