The ratio of solar heat gain through a glazing system compared to that of an unobstructed opening.

A numerical expression between 0 and 1 expressing the performance of glass in transferring heat.

(SHGC): The fraction of solar radiation admitted through a window. SHGC is expressed as a number between 0 and 1. The lower the solar radiation number, the less heat is being transmitted. A high SHGC can help offset a portion of the energy needed for heating in the winter.[xix

The fraction of solar radiation admitted through a window or skylight, both directly transmitted, and absorbed and subsequently released inward. The Solar Heat Gain Coefficient has replaced the Shading Coefficient as the standard indicator of a window's shading ability. It is expressed as a number without units between 0 and 1. A window with a lower Solar Heat Gain Coefficient transmits less solar heat, and provides better shading. Spectrally Selective Glazing: A specially engineered low-E coated or tinted glazing that blocks out much of the sun's heat while transmitting substantial daylight.

The fraction of solar heat admitted through the glass both directly transmitted, absorbed and subsequently released inwards expressed as a number between 0 and 1. If cooling is paramount, the lower the number the better.

Solar heat gain coefficient (SHGC) is the glazing's effectiveness in rejecting solar heat gain. SHGC is part of a system for rating window performance used by the National Fenestration Rating Council (NFRC). SHGC is gradually replacing the older index, shading coefficient (SC), in product literature and design standards. If you are using glass whose performance is listed in terms of SC, you may convert to SHGC by multiplying the SC value by 0.87.

(SHGC) - The solar heat gain coefficient, also called a shading coefficient, is a measure of how well a window absorbs or reflects heat from the sun. The lower the coefficient, the better the window is at blocking the sun's heat. Windows in hot or temperate climates should have a low SHGC; south-facing windows in cold climates should have a high SHGC. Storm Windows - An extra pane of glass or plastic added to a window to reduce air infiltration and boost the insulation value of a window. If you are considering adding storm windows, you should compare the costs to installing new energy-efficient windows.

A measure of the total solar energy transmittance entering a building through the glazing as heat gain. It is the total heat transmission of direct solar transmission and that proportion of absorbed radiation that is reradiated into the building from the action of heat absorbing glass. The lower the solar heat gain coefficient the better the glass control heat energy transmission. The shading coefficient is derived from the solar heat gain coefficient.

The ratio of total solar heat passing through a given window product relative to the solar heat incident on the projected window surface at normal solar incidence (I.E. perpendicular to the glazing surface). The lower the coefficient number for a particular window film/glass system, the better it is able to reduce heat.

SHGC measures how well a product blocks heat caused by sunlight. The lower the window's solar heat gain coefficient, the less solar heat it transmits.

Indicates the percentage of normal incident solar heat energy that makes its way through the glazing under standard summer conditions. This includes both directly transmitted and indirectly transferred heat from energy initially absorbed by the glazing. Lower values indicate less heat entering the building.

The fraction of solar radiation transmitted through a window or skylight. The SHGC has replaced the shading coefficient as the standard indicator of a window's shading ability. It is expressed as a percentage. The lower a window's solar heat gain coefficient, the less Solar heat it transmits, and the greater its shading ability. SHGC can be expressed in terms of the glass alone or can refer to the entire window assembly. SHGC should vary based upon climate and geography with a lower SHGC in the south and a higher SHGC in the north.

The fraction of total solar energy that enters a space through a window. The total solar gain through a windows equals the SHGC multiplied by the incident solar radiation. The Shading Coefficient (SC) is referenced frequently and equals the SHGC for a windows divided by 0.87 (assuming normal incidence).

The Solar Heat Gain Coefficient measures the amount of solar heat that gets through a window. The lower the SHGC, the better a window is at reducing heat gain, and in the end, the cooling costs that go along with it.

The portion of directly transmitted and absorbed solar energy that enters into the building's interior. The higher the SHGC, the higher the heat gain.

A rating, which is now generally replacing shading coefficient, measuring a window's ability to transmit solar heat. It measures both the solar radiation which is directly transmitted, as well as the solar radiation absorbed by the glass and subsequently transmitted. The lower a unit's solar heat gain coefficient, the less solar heat it transmits, and the greater is its shading ability. It is approximately equal to the the shading coefficient divided by 1.15. It is expressed as a number without units between 0 and 1.

Solar heat gain coefficient is a measurement of the amount of solar radiation through a piece of glass or door material. The lower the SHGC, the fewer UV rays that cause heat gain come through the glass.