Different frame materials
Aluminium is strong and lightweight, but conducts heat readily. PVC has different insulating properties. Thermally broken aluminium frames and insulated PVC profiles are approaches to improving frame performance.
Set out the priorities
Start with the opening size, desired sightlines, finish and operating style. Compare actual systems against this brief, with their glazing and technical documentation, rather than choosing solely by material name.
Review the finished window
Ask for samples and review the complete window specification. Include thermal values, maintenance instructions, hardware and installation details in the comparison, then confirm which option fits both the architecture and the project budget.
