Insulated Roller Shutters: Comfort in Summer and Winter

In summer

Most summer heat gain through a window comes from direct sun on the glass. External shutters stop the sun before it reaches the window, which is more effective than internal blinds that block it after it's already inside. Closing west-facing shutters before the afternoon sun makes the biggest difference.

In winter

Windows lose heat on cold nights. Closing shutters after dark adds a layer and a pocket of still air outside the glass, which helps keep warmth in.

What makes a shutter "insulated"?

Insulated roller shutters usually have slats filled with foam rather than a single skin. The fill and the fit of the shutter both matter. Ask for product information on any shutter described as insulated.

Realistic expectations

Shutters can help a room stay more comfortable and may reduce how hard heating and cooling work, but savings depend on the home, the windows and how the shutters are used. Be wary of anyone promising specific energy savings without evidence.

• Close sun-facing shutters before the heat of the day
• Close shutters at dusk in winter
• Electric shutters and timers make this easier to do consistently