Understanding U-Values – What They Mean For Your Home & Sash Windows


U-values measure how much heat is lost through your home’s windows and doors. The lower the U-value, the better thermal performance the window or door offers and, in turn, the more energy efficient your home will be.

A high U-value means that more heat is lost, resulting in higher bills for heating and cooling your property because more energy is used to keep conditions inside comfortable. Over time, this can soon add up in terms of cost and environmental impact from burning fossil fuels such as coal or oil to generate electricity to power domestic heating systems.

Replacement sash windows typically have an impressive low U-Value rating of 1.4 W/m2K due to their multi-layer glazing system, which traps air within it – slowing down heat transfer from warmer areas like inside your room to colder spots like outside walls. This helps retain warmth where you want it while providing excellent insulation.

You can also introduce secondary double glazing into older wooden window frames as an additional way of modernising them with improved thermal efficiency if noise pollution is an issue you would like addressed on top of more significant energy savings. Doing so will generally reduce u-values further still by creating yet another obstacle between external elements causing drafts and cold air ingestion and the climate-controlled indoor living space of your property, reducing thermal transgression even further, meaning less reliance on costly heating methods during colder weather periods throughout both winter AND summer seasons effectively lowering utility bills accordingly.

Energy efficiency can reduce your heating bills and become more environmentally friendly. With sash windows offering greater thermal efficiency alongside a long-lasting design aesthetic, they are an ideal choice for anyone looking to make their home more energy-efficient and cost-effective.

Why Choose Super Sash Windows?

Super Sash Windows is a trusted name in the window and door industry, equipped with specialist staff that can provide expert advice on all aspects of sash windows. They offer an extensive range of u-value rated replacement double-glazed sash windows, made to measure to fit your exact requirements – whether you want classic Georgian features or contemporary style.

The team at Super Sash Windows are proud to maintain traditional sash window designs while ensuring they meet up-to-date regulations regarding energy efficiency. U-values from 1.4 W/m2K have been cited by many as desirable for ‘green building’ standards across Europe and beyond, something our windows readily exceed compared with other mainstream branded products available elsewhere in the market today.

An episode of Channel 4’s TV series Restoration Home included designer Charlie Luxton expressing his admiration for some refurbished sliding box frames featured within their show, en route highlighting his opinion ‘that there are still older sashes out there worth preserving’.

It, therefore, stands testament to the claim that if treated correctly, wooden window frames remain perhaps one of the most timeless pieces inside period properties – an attribute largely attributed towards low U-Values possessed by existing units coupled with modern updates accomplished using our saws year guarantee covers supplied alongside all product orders placed now unless otherwise specified prior purchase.

From bespoke draftsman design slots through CAD software systems through custom colour fading alternatives picked directly during the ordering process itself – up until now, it’s never been an easier or more cost-effective way to upgrade a wooden frame into state art which shall withstand years of test time! The crew at Super Sash Windows provides no less than top-tier customer satisfaction whilst remaining competitive within independent third-party price points constantly set throughout the UK storefront’s subscribed service offerings. Rest assured, friends…

We can Help You Understand U-Values

At Super Sash Windows, we understand that u-values are essential when considering energy efficiency for your home. That’s why our team of experts is here to help you find the best solution for your needs. With years of experience in sash window installation and repair, we have the knowledge and skills to guide u-value ratings most suitable for particular room orientations or even personal preferences if needed; after all – happiness starts from within one’s own four walls!

From CAD design services through digital ordering options – budget average fixed cost tooling operations coupled with free 10-year insurance policies protecting surface integrity by lathering it up with a glossy layer of paint – there’s something for everyone as Super Sash Windows! So please don’t wait any longer: contact our friendly sales team today to discuss what they can do for you!

Gregg Richards

Gregg Richards

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Our guys are on hand 24/7  to ensure that we get back to you as soon as we can. Find out how we can restore the sash windows in your home today.
Any sash windows that require replacement will be crafted as close to the original as possible because we know how important it is to maintain the home’s original character.







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