Is double glazing worth it purely for energy savings?
On energy savings alone, double glazing has a long payback period, typically 15-25 years. This makes it a poor investment compared to loft or cavity wall insulation. However, double glazing provides significant non-financial benefits: noise reduction, reduced condensation, improved security, and EPC improvement that can affect mortgage rates and property value.
What is the difference between double and triple glazing?
Triple glazing adds a third pane of glass and an additional air or gas gap, improving insulation further. In the UK climate, the additional energy saving over double glazing is relatively small, typically GBP20-GBP40 per year, while the cost premium is 20-30%. Triple glazing is most cost-effective in very cold climates or for properties with very large glazed areas.