Why aluminium roller shutters?  

Key word - energy saving: how much energy can I save?
 

A closed roller shutter provides excellent protection from solar radiation and is the ideal energy-saver for the cold winter months. Thanks to the insulating air cushion between the roller shutters and the window, thermal insulation can be improved up to 45%. This means a reduction of nearly 10% in primary fuel consumption. Street noise is reduced by up to 10 decibels when shutters are closed.
Unlike a lintel box, primary fuel consumption is reduced with an Alulux front-mounted roller shutter since there is no medium between the shutter system and interior room by which heat can escape.