Low solar heat gain low-E glass is shown here to reject most of the UV and near infrared solar heat, while transmitting most of the daylight. By contrast, clear double pane will transmit 56% of UV, 81% of visible, and 76% of the solar infrared heat.

The low-E glass can greatly reduce air conditioning bills when compared to standard glass and it also allows homeowners to avoid the installation of shadescreens, shutters or blinds that would otherwise be employed to block solar heat.

While these shading devices do somewhat reduce solar heat gain, they all block a great deal of visible daylight, resulting in a dark interior or the use of electric lights during the hottest days.

Windows with low solar low-E glass do the work of a shading device while allowing the daylight into the room. This allows enjoyment of the view outside, makes a home feel brighter and more spacious, and avoids use of electric lighting in daylit rooms during summer days.