A rated windows are a huge improvement over most of the double glazed windows installed over the last 30 years, almost all of which will lose nearly twice as much heat as an A rated window. With energy prices constantly rising, the benefit of installing an ‘A’ rated window will not only help the environment, but will save thousands of pounds on household heating bills. Now is the time to replace Timber, PVC-u and Aluminium windows with Timberlook A rated windows which have the appearance of timber without the maintenance costs. Please note the ‘A’ rated specification must be specified when ordering.
Over 20 years a saving of at least £11,420 and a saving of 22.87 tonnes of CO2 emissions & 6.24 tonnes of carbon emissions can be achieved when Timberlook Nett Zero Heat Loss ‘A’ rated windows are installed*
In addition to the increased comfort, sound insulation and reduced draughts, Timberlook windows save thousands of pounds in maintenance costs when compared with timber windows.
There are big differences between ‘A’ rated windows which home owners should be aware of. Window energy ratings (A – G) were introduced to provide an accurate measurement of the energy efficiency of windows. Previously the frame of the window which usually makes up 25% of the window area was not taken into account. To achieve an ‘A’ rating using PVC-u frame profiles that are current but designed years ago requires the use of glass with a high solar factor, this allows more UV radiation through increasing the solar gain of the unit, which effectively compensates for the poor energy efficiency of the PVC-u profile allowing an ‘A’ rating to be achieved.
Timberlook PVC-u windows use an up-to-date 5 chamber profile specifically designed to be so thermally efficient that an ‘A’ rating can be achieved without the need for high solar factor glass. This redesign is the result of millions of pounds of investment over the past eighteen months.
The main problems with high solar factor glass are the discoloration of fabrics and furniture, especially when a window faces south or west, due to the extra UV getting through. Also, higher room temperatures will be experienced in the summer, which could make rooms uncomfortable to sit in.
An ‘A’ rated window using high solar factor glass will lose up to 15% more heat in winter as the equivalent ‘A’ rated window without high solar factor glass.
Check the Energy Label on the retailers’ literature and it will say what the solar factor is. If it is 0.41 it will not have high solar factor glass.
There are no accurate figures to say exactly but a good guess is 80% or more because the cost of updating PVC-u frame profiles is very expensive.
* Figures have been taken from the Carbon Calculator developed by the GGF and the calculations have been verified by the Energy Savings Trust – homeowners can access the Carbon Calculator by going to www.ggf.co.uk Figures quoted are for replacing single glazing in a detached house with 23 sq metres of glass and heated by gas with a fuel inflation rate of 9% – oil central heating would increase savings by an additional 50% and electric heating on day tariff would double the saving.
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