Two quotes can both say ‘double glazing’ while delivering very different results. Compare glass make-up, cavity, Low-E coatings, spacers, frame type, seals and installation.
- Whole-window U-value and SHGC
- Standard aluminium vs thermally broken frames
- Acoustic laminated and asymmetric glass options
- Solar-control and Low-E coatings
- Ventilation and condensation strategy