How Energy-Efficient Windows Can Keep Your Home Warmer This Winter
8th of September, 2026
There’s always a point towards the end of summer when you notice it: the mornings feel a little cooler, the evenings draw in and suddenly those small draughts around an older window or door become much more obvious.
As we head into autumn, it’s a good time to think about how well your home is holding onto its warmth.
Modern energy-efficient windows and doors are designed to reduce heat transfer between inside and outside, helping your home feel more comfortable as temperatures fall. If your existing windows are older, draughty or poorly fitting, replacing them can make a noticeable difference to how your home feels through autumn and winter.
Why do windows make such a difference in winter?
Windows form a significant part of the exterior of most homes, so their thermal performance has a real effect on indoor comfort. Older glazing, tired seals and poorly fitting frames can allow warmth to escape and cold air to find its way in. Modern windows are designed very differently, using a combination of glazing technology, insulated frames and improved sealing to reduce that heat transfer.
Features can include:
- Double or triple glazing
- Low-E glass
- Insulated window frames
- Argon-filled glazing units
- Warm-edge spacer bars
- High-quality seals
- Professional installation
Together, these elements help keep more of the warmth you are paying to create inside your home.
What does Low-E glass actually do?
Low-emissivity, or Low-E, glass has a very fine coating designed to control the movement of heat through the glazing. During winter, it helps reduce heat loss through the window while still allowing plenty of natural daylight into the room. It is now commonly used across modern uPVC, aluminium and other high-performance window systems. It is one of those details you may never particularly notice day-to-day, but it forms an important part of making a modern window more thermally efficient.
Double glazing or triple glazing?
Both can offer excellent thermal performance. A double-glazed unit uses two panes of glass separated by an insulating cavity, reducing heat transfer compared with a single pane. Modern units can also incorporate Low-E coatings, insulating gases and other technologies to improve their performance further. Triple glazing adds another pane and insulating cavity, which can provide an additional level of insulation. That doesn’t automatically mean it is the right answer for every house, though. The property, orientation, existing construction and individual window specification should all be considered. At Croft, we would always rather specify the right window for the house than simply the highest specification on paper.
The frame matters too
Good glazing is only part of the picture. Modern uPVC frames typically use multi-chambered construction to help reduce heat transfer, while contemporary aluminium systems incorporate thermal breaks within the frame. Timber is naturally insulating and remains a particularly lovely choice for period and character properties. The best option depends not only on energy efficiency, but on the architecture of the house, the proportions of the openings and how you want the finished exterior to look.
Don’t overlook the doors
A cold hallway isn’t always down to the heating. An older external door that has begun to warp, lose its seal or simply wasn’t particularly well insulated in the first place can allow both draughts and heat loss. Modern external doors can incorporate insulated cores, high-performance glazing and improved weather seals, helping them contribute to the overall thermal efficiency of the house. Composite doors are particularly popular where homeowners want a combination of thermal performance, security, durability and relatively low maintenance. Modern aluminium doors can also perform extremely well, particularly for larger openings such as sliding and bifold doors, where contemporary systems use thermal breaks to reduce heat transfer through the frame.
Why fitting is just as important as the product
Even an excellent window or door will not perform as it should if it isn’t fitted properly. Small gaps around frames can allow air movement and undermine the thermal performance of the whole installation. Correct fitting helps provide effective weather sealing, reduce draughts and support better thermal and acoustic performance over the life of the product. It’s one of the reasons we put so much emphasis at Croft on the installation itself, rather than treating fitting as simply the final stage of the job.
Is autumn a good time to replace your windows?
Very much so.
Autumn is often when the weaknesses in older windows and doors start to make themselves known again: a draught beside the sofa, condensation becoming more noticeable, or a room that suddenly feels harder to warm. Replacing older, single-glazed, draughty or poorly fitting windows and doors can help reduce heat loss, improve comfort, improve sound insulation and reduce reliance on heating. And doing the work before the coldest part of winter means you get the benefit when it matters most.
Choosing the right windows and doors for your home
There isn’t one specification that suits every property. The size and position of your windows, the amount of glazing, the frame material and the glass specification all affect overall performance. That’s where good advice makes the difference. At Croft, we can help you choose windows and doors that suit the character of your house as well as the way you live in it - keeping the proportions and appearance right while improving comfort and energy efficiency behind the scenes.
Thinking about replacing your windows or doors before winter?
Visit our Fulwood showroom or speak to the Croft team on 01772 703 777.
FAQs
Do new windows make a house warmer?
Modern energy-efficient windows can reduce heat transfer through the glazing and frames, helping your home retain warmth more effectively than older or poorly fitting windows.
Does double glazing help keep heat in?
Yes. Two panes of glass separated by an insulating cavity reduce heat transfer compared with single glazing. Modern units can also use Low-E coatings and insulating gases to improve performance further.
Is triple glazing always better than double glazing?
Not necessarily. Triple glazing can provide excellent insulation, but the best specification depends on the individual property and window system.
Can replacing my front door make my home warmer?
It can. Modern external doors with insulated cores and better weather seals can reduce draughts and heat transfer compared with older or poorly fitting doors.
Does installation affect energy efficiency?
Absolutely. Poor fitting can leave gaps around a frame and reduce the thermal performance of even a very good window or door.