In buildings, heat mostly enters and exits from windows and other openings.

Source: An example case for a model house built in accordance with the 1992 Energy Efficiency Standard, cited from “Implement thermal insulation of openings in houses in the 21st century...!” advocated by the Energy-saving Construction Material Dissemination Center of the Japan Construction Material and Housing Equipment Industries Federation.

For this reason, energy-saving films for windows are used for energy-saving repair at building openings; however, they are mostly only effective in the summer.

PENJEREX is a glass film. When simply applied to a window, PENJEREX improves air conditioning efficiency by cutting solar heat that enters through the window in the summer and reducing the amount of heat that escapes from the window in the winter. As a result, the interior is maintained at a comfortable temperature both in the summer and in the winter.

When comparing solar heat entering from outside of a room and reaching a desk in front of a window, a temperature difference of approximately 8°C was observed. PENJEREX cuts solar heat and prevents it from entering the room, thus ensuring coolness and increased comfort near windows even in the summer season.

To watch how heat escapes from a window, the surface temperature of a window was monitored using a thermo-camera from outside of the room. The non-film-applied window recorded a higher temperature because heat was escaping through it. On the other hand, the window with PX-7060S applied had a lower temperature because PX-7060S blocked the heat from escaping.

Our hands are warm and release far infrared rays, whereas glass (with no film) does not reflect far infrared rays (Figure B). In contrast, PENJEREX reflects far infrared rays like a mirror, thus preventing heat escape to the outside, confining the warmth to the inside of the room (Figure A).

Reduces heat and coolness at the window.