uPVC windows achieved thermal performance via multi-chambered mouldings built into the frame’s inner profile. Acoustic insulation is also improved in the same way via trapped air layers within the frame moulding. uPVC frames coupled with a suitable glazing choice and tight installation can deliver up to 70% noise reduction and at high thermal efficiency.
In terms of window quality of construction, this varies with cost. One of the main things is to look for is welded joints across the entire window. This is because cheaper offerings substitute mechanical fixings in some places and aren’t as reliable.
Also look for good quality in the locks and hinges and ask if they are covered under the guarantee. uPVC windows are not easy to repair, so this aspect is important and not so easy to know by eye. When choosing your window system, insist on a minimum two year guarantee for all moving parts on the window. In doing that you will be ensuring a reasonable quality.
For industry quality standards look for uPVC windows certified to BS EN12608 and BS7412