5 Benefits of Energy-Efficient Steel Windows
- August 7, 2025
- General
The demand for energy-efficient building solutions has never been higher, with property owners and professionals prioritising thermal performance.
Steel windows, once considered largely for aesthetic reasons, now incorporate cutting-edge energy efficiency technology. This means that, alongside looking beautiful, steel windows can significantly reduce heating and cooling costs whilst maintaining the distinctive character that makes them a top choice for projects.
Through innovative thermal technology and high-performance glazing, today’s steel windows achieve remarkable thermal properties, making them a smart choice for virtually any home or project.
Why is steel is a great material for energy efficient windows?
Steel’s reputation as a premium window material extends far beyond its visual appeal. When properly engineered with thermal break technology, steel windows offer remarkable energy performance that rivals and often exceeds other materials. This is due to its inherent strength and durability, alongside modern thermal technology and engineering.
Structural strength
The inherent strength of steel allows for incredibly slim sightlines whilst maintaining structural integrity. This means larger panes of glass can be supported with minimal window frames, maximising natural light whilst reducing overall heat transfer through the frame structure.
Advanced thermal technology
Modern steel windows incorporate sophisticated thermal technology that interrupts the thermal conductivity of the material. This technology prevents heat loss in winter and heat gain in summer, maintaining consistent indoor temperatures year-round.
Durability
Steel windows withstand extreme temperatures and weather conditions without warping, expanding, or deteriorating. This longevity means fewer replacements over time, reducing environmental impact and long-term costs compared to vinyl or fiberglass alternatives.
Precision engineering
The manufacturing process allows for robust sealing systems, minimising air leakage and moisture infiltration. This attention to detail translates directly into improved energy efficiency and reduced condensation issues.
Revolutionary thermal performance: Crittall W20 TE
Lightfoot Windows offers a selection of energy efficient Crittall external steel windows designed to meet the most demanding thermal performance requirements.
A robust rolled steel system, the Crittall W20 TE system is specifically designed for superior thermal efficiency. The W20 TE system provides the large glass areas and slim profiles that define quality steel windows, but with thermal performance that meets modern energy efficiency requirements.
The W20TE profile achieves an overall U value as low as 1.4 W/m² K. This system also offers a thermal gradient across the profile equivalent to that of a thermally broken steel section.
This system achieves improved thermal performance through careful engineering, helping to reduce energy consumption in homes and commercial buildings across the UK.
Manufactured from 100% recycled steel, the W20 TE system offers strong durability with a life expectancy of over 60 years, whilst preserving the slim sightlines that allow maximum natural light into spaces. The system provides versatile customisation options in any RAL, BS, or bespoke colour.
Homelight® profile: style & thermal performance
Alongside the W20TE profile, Crittall’s Homelight® profile offers excellent thermal performance.
The Homelight profile achieves an impressive Doorset Energy Rating (DSER) of up to A+ and a Window Energy Rating (WER) of B, demonstrating its capability to significantly reduce heat loss and improve overall building energy performance.
This exceptional thermal efficiency is achieved through advanced weatherstripping and insulating glazing systems, ensuring homeowners benefit from reduced energy consumption and lower heating bills whilst enjoying the timeless aesthetic of steel.
5 Benefits of energy efficient steel windows
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Improved thermal efficiency
Modern steel windows with thermal break technology significantly reduce heat transfer, maintaining comfortable indoor temperatures regardless of external conditions. The advanced glazing systems and precision sealing eliminate thermal bridging, ensuring your building envelope performs at its peak.
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Reduced energy consumption
By minimising heat loss during winter and preventing unwanted heat gain in summer, energy efficient steel windows dramatically reduce the demand on heating and cooling systems. This translates to lower energy consumption and reduced carbon footprint.
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Lower energy bills
The superior insulation properties of modern steel windows directly impact your energy bills. Homeowners typically see substantial reductions in heating and cooling costs, with the savings often offsetting the initial investment within a few years.
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Improved home style
Energy efficient steel windows don’t compromise on aesthetics. The slim profiles and clean lines complement both traditional homes and contemporary architectural styles. Whether you choose classic black steel or custom configurations, these windows add timeless elegance to any project.
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Increased property value
Properties with high-performing windows benefit from improved energy performance ratings. The combination of reduced energy loss, excellent security features, and aesthetic appeal makes energy efficient steel windows a valuable investment that enhances property value.
Lightfoot: steel window specialists since 1935
Since 1935, Lightfoot Windows has been the UK’s premier Crittall windows specialist, offering unparalleled expertise in energy efficient glazing solutions. Our commitment to quality and sustainability sets us apart:
Proven track record
As the largest Crittall specialist within the network, we have extensive experience in delivering energy efficient solutions for diverse architectural projects. Our craftsmanship has stood the test of time across countless installations.
Expert installation
Our FENSA accreditation ensures all installations comply with building regulations and energy performance standards. This certification provides peace of mind that your windows will perform as designed.
Comprehensive support
From initial consultation through to installation and beyond, our expert team provides tailored solutions that meet your specific energy efficiency requirements whilst respecting your architectural vision.
Energy efficient steel windows from Lightfoot Windows: contact our team today
The architectural versatility of steel windows means they complement any style, from period properties to cutting-edge contemporary designs. With minimal maintenance requirements and robust construction, they provide long-term value that extends well beyond their initial installation.
Contact Lightfoot Windows today for expert advice and a free quote. Our experienced team is ready to discuss your specific requirements and provide tailored solutions that deliver exceptional energy performance.
Fill out our online contact form, call 020 8662 9090 or general@lightfootwindows.co.uk.
Want to get a quick estimate on new Crittall windows? Simply visit our ‘Get An Estimate’ page and fill out the required information. One of our friendly experts will get back to you within 48 hours.