Energy Efficient Windows
Industry Leading Energy Savings, Made in Germany
As home to the Passivhaus standard and high tech manufacturing, Germany is world renowned for its high quality windows with excellent insulation performance. Whereas old windows may be paid for, they unfortunately continue to cost you money every month due to heat loss and higher energy bills. Whether replacement windows or new construction, choosing modern energy efficient windows will save money in the long run and are often even eligible for government subsidies or tax credits in many countries. As building regulations require greater efficiency and energy prices rise, high quality German windows will add value to your home while reducing bills over time.
Heat Loss in Windows Explained
Windows can lose heat in a number of ways, beginning with the area between the frame and masonry or wall. Professional installation is critical to ensure that the outer area of the frame is installed properly and sealed against air infiltration. The best window in the world cannot make up for poor installation and gaps with the masonry.
Next, seals can allow cold air in and warm air out. Opening mechanisms like hung sash windows constantly rub against the seals every time the window is open and closed leading to their rapid deterioration. Many older windows also feature far fewer seals than those today. Finally, the frame and glazing itself can lose heat via conduction. With single glazed windows, conduction is a particularly large source of inefficiency. To summarize, heat loss can be attributed to:
- Air leakage between the frame and masonry
- Air leakage from worn seals
- Conduction via the frame
- Conduction via glazing.
What Material are Windows made from?
Energy conduction via the frame is one source of heat loss and thus the choice of frame material plays an important role in the overall energy rating. The exact same triple glazing will perform the same whether in timber, uPVC or aluminium (i.e. have the same Ug-value). However, the frame's efficiency, or Uf-value, will still affect the overall window value (Uw-value).
Thus, energy efficient windows are most frequently made of uPVC which is both easy to work with and can be engineered with multiple internal chambers. Timber, on the other hand, naturally features good thermal insulation properties. However, it cannot be further improved to overcome its natural limitations. Aluminium, being metal, is naturally conductive and is therefore often only used for external cladding. When used alone, the window must be thermally broken meaning the exterior portion is separated by another material from the interior so that energy cannot move from one side to the other.