Your heating bill arrives. It is higher than last year. Again.

You have switched energy providers, turned the thermostat down, and put on an extra jumper. But nobody has mentioned the obvious: your windows are letting the heat out.

The forgotten heat leak

Up to 30% of a home’s heat is lost through the windows. Not because the windows are broken or the seals have failed, but because glass is simply a poor insulator. Even modern double glazing allows significant heat transfer.

Most homeowners think about insulation in terms of loft, walls, and floors. Windows rarely get a mention, despite being responsible for the largest proportion of heat loss per square metre of any surface in your home.

What shutters do to heat loss

Interior shutters create a secondary barrier between the cold glass and your warm room. When the louvres are closed, they trap a layer of still air between the shutter panel and the window. Still air is one of the best insulators there is.

The result is measurable. Homes with shutters report reduced condensation (a sign that the inner surface is staying warmer), more consistent room temperatures, and lower heating bills, particularly in rooms with older or larger windows.

Cellular blinds: the insulation specialists

If energy efficiency is your priority, cellular blinds (honeycomb blinds) are the most effective window covering available.

Each blind contains rows of honeycomb shaped cells that trap air in insulating pockets. The effect is similar to double glazing, but without replacing the window.

Duette cellular blinds from Luxaflex are independently tested and shown to reduce heat loss through a window by up to 46%. In a Scottish winter, where heating runs for six months of the year, that adds up quickly.

The combination approach

Many of our customers use shutters and cellular blinds together, shutters for everyday light and privacy control, with a cellular blind fitted behind for maximum insulation when needed.

This combination gives you the best of both worlds: the style and durability of shutters with the thermal performance of cellular technology. It is particularly effective on north facing windows and in older properties with single or early double glazing.

The maths

A typical three bedroom home in Scotland might have 12 to 15 windows. If shutters or cellular blinds reduce heat loss through each window by even 25%, that is a meaningful reduction in the energy needed to keep the house warm.

We are not going to promise specific savings, because every home is different. What we can say is that customers consistently tell us their homes feel warmer, their heating runs less, and the difference is noticeable from the first winter.

See the full range

Our energy saving blog post goes into more detail on the science behind shutter insulation.

To explore the full range of shutters, blinds, and the materials available, request our 52 page brochure. It is packed with real installations from homes across Scotland.

Or call us on 0800 086 2989 to talk through your options. No pressure, no salespeople. Just honest advice from people who have been doing this since 1987.

Energy Bills Rising? The Window Upgrade Most Homeowners Miss