As energy costs continue to rise and environmental concerns grow, homeowners in Cornwall and Devon are increasingly seeking ways to improve their homes’ energy efficiency.
Double-glazed windows have become a cornerstone of energy-efficient home improvements, offering significant benefits in terms of thermal insulation, noise reduction, and cost savings.
In this guide, we’ll explore the various aspects of double-glazed windows, from materials and their variety of styles to glass types and energy ratings.

Sliding sash windows bring a traditional charm to properties.
Thermally Efficient Window Materials
Aluminium Windows
Modern aluminium windows feature thermal breaks and advanced engineering to prevent the transfer of heat.
These windows offer exceptional durability, slim sightlines, and contemporary aesthetics.
Aluminium is an incredibly strong material, meaning it’s capable of supporting expansive glass panes – great for natural light intake whilst maintaining excellent thermal performance.
Available in numerous RAL colours, including popular anthracite grey, these windows combine style with functionality.

Aluminium is known for its slim frames, which in turn allows more natural light ot enter your space.
uPVC Windows
uPVC (unplasticised polyvinyl chloride) windows are the UK’s most popular choice for replacement windows.
These cost-effective solutions offer excellent thermal insulation through multi-chambered profiles.
White uPVC window frames remain a classic choice, but modern manufacturing allows for various colours, including Chartwell green and woodgrain effects.
The material requires minimal maintenance and provides outstanding value for money.

Liniar 70mm Tilt & Turn Window with an elegant arched frame, designed for secure ventilation and thermal efficiency.
Timber Windows
Traditional timber windows offer natural insulation properties and timeless appeal, for energy saving and style. Modern manufacturing techniques ensure superior durability and reduced maintenance requirements. Sustainably sourced timber options provide excellent thermal efficiency while maintaining authenticity for period properties.
Double Glazed Window Styles
Casement Windows
The most common window style in the UK, casement windows feature side or top hinges and open outward. They offer excellent ventilation control and can be combined in various configurations. Easy to operate and clean, they provide superb energy efficiency and security.

Casement windows can be found on most streets across the UK.
Tilt & Turn Windows
These versatile windows offer two opening functions: a tilt position for ventilation and a turn position for full opening. Perfect for high-rise buildings or difficult-to-access areas, they combine practicality with modern style.
Sliding Sash Windows
Traditional in appearance but modern in performance, sliding sash windows move vertically and can incorporate period features like Georgian bars. They maintain heritage aesthetics while delivering contemporary energy efficiency, and are great for ventilation when the weather’s right.
Flush Casement Windows
Featuring sashes that sit flush with the frame, these windows offer clean lines and traditional styling. Popular in both period properties and modern homes, they combine classic aesthetics with current performance standards.

Flush casement windows sit perfectly level with the frame.
French Windows
Double-opening windows that provide maximum ventilation and unobstructed views. Ideal for creating Juliet balconies or maximising natural light, they’re a charming addition to any home.
Bay Windows
Projecting beyond the external wall, bay windows create additional internal space and enhanced views. They can incorporate various opening styles and significantly increase natural light while improving thermal performance.
Glazing Options
Double Glazing
Two panes of glass are separated by an inert gas (typically argon) spacer bar. This creates an insulating barrier that significantly reduces heat transfer. Standard double glazing offers excellent thermal efficiency and noise reduction.
Triple Glazing
Three panes of glass with two gas-filled cavities provide superior thermal insulation. Ideal for noise-sensitive areas or properties requiring maximum energy efficiency. While more expensive, triple glazing offers the highest window energy ratings.
Secondary Glazing
An additional window pane installed alongside existing single-glazed windows. Perfect for listed buildings or conservation areas where replacement isn’t possible. Provides improved thermal and acoustic performance while maintaining original windows.
Acoustic Glass
Specially laminated glass that reduces noise transmission. Can be incorporated into double or triple glazing units for enhanced sound insulation. Ideal for properties near busy roads or in urban areas.
Energy Efficient Double Glazed Windows from DNA Window Solutions
We offer a comprehensive range of window solutions with various customisation options.
Our windows are available in an extensive colour palette, including contemporary greys, traditional whites, and heritage colours.
Hardware options include modern handles, traditional monkey tail designs, and security features that meet PAS 24 standards.
About DNA Window Solutions
With over 25 years of experience, we’re your local window specialists serving Cornwall and Devon. Our showroom in Plymouth showcases our full range of double glazing products, and we offer free, no-obligation quotes. Contact us at 01752 938120 or sales@dnawindowsolutions.co.uk to discuss your requirements.
As well as windows, we also offer an elite range of doors, including composites and bi-folds, as well as conservatories and porches.
All our windows are manufactured in Britain and installed by our experienced team. We’re committed to providing energy-efficient solutions that enhance your home’s comfort and value while reducing energy costs.
Visit our showroom at Unit 92, Christian Mill Business Park, Tamerton Foliot Rd, Plymouth, PL6 5DS to explore our range and discuss your requirements with our expert team. Alternatively, you call contact our friendly team by phone (01752 938120) or email (sales@dnawindowsolutions.co.uk).

The experienced team at DNA Window Solutions, specialists in windows, doors, and conservatories.