Normal single-glazed windows release about a third of the heat in a room, i.e. they are major energy-wastersHeat loss is stated as a U value, which is a measure of the insulating efficiency of the combination of glass, frame and casement. The lower the U value the better the insulation. Grundels' sealed glazed units reduce a window's U value to about 1.2, thus reducing the energy loss by about 60%. The total energy saving is as much as 30%, leading to a relatively short repayment time on the overall investment.
Another effect of energy-saving windows is a reduction in downdraughts. When the indoor environment is not perceived as being draughty you can lower the temperature by about 2° without reducing comfort. This reduces energy consumption by a further 4-6%.
As well as saving energy, sealed glazed units contribute towards reducing wastage of resources. Existing and sound windows can remain in place instead of materials and resources being put into production of new products. Old windows also use very high-grade wood - something well-nigh impossible to find nowadays.
Installation of sealed glazed units halves noise disturbance in propertiesNoise decreases by 5 to 13 decibels. We have thus often been hired by government clients such as the National Swedish Civil Aviation Administration and the National Swedish Road Administration, who require protection of surrounding buildings against noise disturbance.