Window Experts Reveal How Putting Yours in 'Winter Mode' Takes Just 10 Seconds and Cuts Heat Loss by Up to a Third

It's so easy to do

A cozy living room with a large L-shaped velvet couch with cushions, a large velvet rug, marble coffee table, and large windows with patterned curtains. In the back corner is a large black lamp, and in the foreground is a green chair with a wooden frame and two cushions.
(Image credit: Future / ONE REPRESENTS LTD (MEL YATES))

During winter, we all know that drafts can be one of the main culprits that hinder all the effort we put into warming our homes.

But, say our window experts, there's one small yet oh-so-simple task you can do to cut heat loss by up to a third, and it takes only mere moments.

What is the 'Winter Mode' for Windows?

To find out more about 'winter mode' for windows, we spoke to the experts at Express Bi-Folding Doors, who explained that many modern windows come with an adjustable feature that allows you to pull the window tighter into the frame when closed.

This has recently been dubbed as the 'winter mode' setting on social media, which accurately explains the way in which it helps to reduce cold drafts from seeping in.

'Switching your windows into winter mode is a really quick process; it usually takes no more than a minute per window with a standard allen key,' explains Geoff Clarkson, window fitting expert at Express Bi-Folding Doors. This 26-piece Amazon Basics Hex Key Allen Wrench should be all you need.

'And you only need to do it once before the weather gets really cold, and it can easily be reversed next spring,' adds Geoff, once attention turns back to keeping your home cool.

How to Put Your Windows in 'Winter Mode'

Blurred crittal windows with dried branches in a glass jar in the foreground, placed on a marble countertop next to some dried flowers. Behind is a chair with wooden arms and a grey cushion.

It hardly takes any time at all to put your windows in 'winter mode' and save money on otherwise wasted heat

(Image credit: Future / TATTERSALL LOVE LTD (HELEN CATHCART))

To do this, begin by opening your windows and looking for small screws along the inside of the frame, which usually fit an Allen key and have a small notch that typically points to 12 o'clock.

Then, insert your Allen key and turn the screw clockwise a quarter of a turn, which will draw the window closer to the frame, reducing gaps and effectively draft-proofing a living room, draft-proofing a bedroom, or draft-proofing a sunroom. After adjustment, the notch should then point to three o'clock.

'Close your window to check the fit,' advise the experts at Express Bi-Folding Doors. 'If it feels too stiff, ease it slightly by turning the screw back so the notch sits at one or two o’clock. This prevents the rubber gaskets from being overly compressed, which could damage them over time.'

Though this only takes a few seconds, the difference it can make over the colder months in terms of cutting your energy bills is impressive, particularly with older windows.

'In fact, estimates show that home windows can be responsible for between at least 10 to 15 per cent of the energy that escapes a property,' advises Geoff. 'By adjusting them into winter mode and tightening the seal, you reduce the draughts and stop unnecessary warmth escaping.

'While it won't replace the need for good glazing and insulation, it can cut heat loss through gaps by up to a third.'

Other Steps Homeowners Can Take to Reduce Window Drafts

A bright living room with striped rug, black coffee table with flowers and coffee table books, white couch with cushions, white and black floor lamp, and large doors to a green leafy garden with a double layer of grey and white curtains.

Layering curtains is an effective way to block window drafts.

(Image credit: Future / BRENT DARBY PHOTOGRAPHY LIMITED)

The head of Solved, Punteha van Terheyden, here at Homes & Gardens has been dealing with drafts in her newly-built home, and says 'fixing them has made a big difference to my energy costs.'

She recommends:

What to Shop

All prices were correct at the time of publication.

Meet the Experts

Headshot of brunette Punteha in burgundy collared long sleeve dress against a terracotta painted wall background
Punteha van Terheyden

As the Head of Solved and a DIY enthusiast, Punteha is an expert when it comes to all things practical at home. Previously, she was the editor of Real Homes, and has written and edited lifestyle and consumer articles since 2008.


While you need to stop drafts, you'll also need to stop condensation on windows overnight to prevent mold and mildew.

Ottilie joined Homes & Gardens last year, after finishing a Master's in Magazine Journalism at City, University of London. With previous contributions in Livingetc and Motorsport Magazine, she produces content for the Solved section on the website, focusing on clever tips and tricks to keep your home beautiful, organized, and clean, with particular expertise on all things home fragrance. She also has a Master's degree in English Literature and History of Art from the University of Edinburgh, where she developed a love for inspiring interiors and architecture.