Each UPVC window frame contains several internal chambers within its profile. The chambers within the frame are designed to be thermally efficient by creating barriers that prevent heat loss from inside the home and from cold entering the home from outdoors.

Glazing adds an extra layer to maximise heat retention indoors and to relay solar heat from outside through the use of energy reflecting glass as a standard. The glazing panes connected by thermo spacer bars which remove cold areas from the ends of the unit to eliminate condensation.