How A+ Rated Glass Units Cut Your Energy Bills

If your heating seems to run constantly and your rooms still feel cold near the windows, the glazing is often the reason. Older or failed sealed units lose heat at a far higher rate than modern glass, and that lost heat goes straight onto your energy bills. Swapping to A+ rated sealed units is one of the most cost-effective changes a homeowner can make, and it is simpler than most people expect.

Why do old or failed sealed units cost so much to heat around?

Double glazed sealed units work by trapping an insulating layer of gas, usually argon, between two panes of glass. When the seal fails, the gas escapes and the unit loses much of its thermal performance. Even units that look fine can degrade quietly over time. The result is cold spots near the glass, condensation on internal surfaces, and a boiler working harder than it should to compensate.

What does A+ rated glazing actually do differently?

A+ is the highest energy-efficiency rating for glazing, awarded under the British Fenestration Rating Council scheme. A+ rated units use advanced low-emissivity (low-e) glass coatings and high-performance gas fills to reflect heat back into the room rather than letting it escape through the pane. The difference is measurable: upgrading to A+ rated sealed units can reduce heat loss through your windows by a significant margin, and The Glass Doctor's customers typically see savings of up to 30% on their energy bills.

Do I need to replace the whole window to get A+ rated glass?

No. If your window frame is in sound condition, there is no need to replace it. The Glass Doctor can remove the existing sealed unit and fit a new A+ rated unit directly into your current frame. The job is typically done in under an hour, with no mess and no building work. Because it is a glass-only replacement, you will not need a FENSA or CERTAS certificate, which saves you both time and paperwork.

Why choose The Glass Doctor for an energy upgrade?

With nearly three decades of experience across Lancashire, Merseyside, the Wirral, Cheshire, Manchester, and North Wales, The Glass Doctor has helped thousands of homeowners reduce draughts and cut heating costs. Every sealed unit is made in-house at our own North Wales factory, which means we control the quality from start to finish. All units come with a 10-year guarantee, fitting is included free of charge, and we offer a Price Match Guarantee: bring us a written quote from another glazier and we will match it. Your old units are also collected and recycled responsibly.

If your home feels colder than it should, or your energy bills are higher than you'd expect, it is worth getting your glazing checked. A free, no-obligation quote takes just a few minutes.

Visit theglassdoctor.org or call us free on 0800 7747684 to book yours today.