A traditional double-glazing system has a high transmittancy, allowing that heat passes through the glass. Solar radiation can be reflected or absorbed by the glass, depending on the treatment of this, but in any case we must consider a phenomenon of re-irradiation and overheating of the air chamber.

The RADIAGLASS system creates an isothermal envelope in the skin of the building with the comfort temperature. Heat is transferred from the interior of the building to the water chamber due to temperature difference. A small portion of solar radiation is reflected and a high percentage is dragged by the water chamber, so only a small fraction would finally come into the local.