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Windows are one of the biggest sources of heat loss in the home. The good news is there are plenty of simple and impactful ways to insulate your windows, improve warmth, and make your home feel cosier.
This guide explains the most effective methods, from thermal blinds and well‑lined curtains to DIY draught‑proofing and smart layering techniques.
Windows lose heat in three ways:
Homes with older glazing, aluminium frames or even just larger windows or doors are often the worst affected, but even with modern glazing, cold draughts coming inside and heat escaping outside can make rooms feel chilly and make your reach for the heating thermostat.
One of the most effective ways to insulate windows is to use thermal blinds, which create a barrier between cold glass and warm indoor air.
Specialist styles, such as Duette® and Thermashade™ blinds, have a cellular design that traps air, and studies show they can reduce heating loss by up to 55%.
For standard blinds and shutters professional measuring and fitting is key. A well-fitting blind ensures there are no gaps around the edges where warm air could escape; a small detail that significantly improves insulation.
Curtains are a great way to add warmth and personality to your home and are especially helpful during the colder months. Heavier fabrics like velvet or thermal-lined curtains provide excellent insulation while adding a touch of luxury to your space.
Closing curtains before the sun starts to slip away helps prevent heat gained through the day from escaping through the glass. During the day, open them fully to make the most of natural sunlight.
Another great way to manage heat loss is to layer curtains over blinds or shutters. You’ll not only benefit from the additional insulation, but it adds a luxurious and refined look to your space.
Try blackout blinds with thermal curtains; great for a bedroom to minimise light levels and create a restful environment for sleep but they’re beneficial all around your home.
Blend different textures, colours, patterns and plains for a finish that’s as cosy as it is stylish.
Consider scheduling your heating to come on shortly before you arrive home. Also try to keep radiators clear of furniture, curtains, and any other large décor pieces. This will help to keep the whole room heated up and ensure none of the radiator’s warmth is being blocked.
Another practical thing to do is use draught excluders. You may already have them at your doors to prevent chilly air flowing through your house, but try using them at your windows too, putting them on the window sill to trap any draughts around the frame.
Window film or foam insulating tape is a relatively quick and easy option to try, sealing gaps in warped door and window frames. Simply measure the tape out, cut and remove the backing and press into place.
Door curtains are also great options to keep the chill out at the first instance, especially at your front door.
"Shutters are a flexible choice, giving you the option to keep the frames closed and draughts at bay, but still allowing light in by positioning the louvres to suit you."
MARK, HILLARY ADVISOR
Simple, low-cost options include draught-proof tape and window film. These methods help block draughts and reduce the amount of heat escaping through gaps or single pane glass.
Yes. Insulating blinds and heavier, thermal lined curtains can significantly reduce heat loss, especially in older homes. They create an extra barrier at the window, helping keep warmth inside during colder months.
Upgrading to double or triple glazing provides major long‑term improvements. These windows trap a layer of air or inert gas between panes, reducing heat loss and improving comfort.
You don’t need major upgrades to see benefits. Affordable fixes like draught excluders, caulking, and secondary glazing panels can still make a noticeable difference in warmth and energy efficiency.
Signs include persistent condensation between panes, draughts, difficulty opening or closing, or visible wear to seals. These indicate reduced insulation performance and may mean it's time to consider an upgrade.
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Take a look at our thermal product fabrics and explore ways to add that cosy feeling to your home.
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