Define the priorities first.
Record the opening sizes, operation, desired frame appearance and finish. Add the project’s thermal, acoustic and other performance requirements so the comparison answers the actual brief.
Review available configurations and the required sightlines with each supplier. Material names alone do not describe the proportions, reinforcement, hardware or glazing of the proposed window.
Use comparable evidence.
Request whole-window values using the same units and rating method. Confirm the proposed glass, size and operation represented by the documents. Do not compare one supplier’s centre-of-glass value with another supplier’s whole-window value.
Review warranty documents, installation scope and the details around the opening alongside the product information. Pricing is only comparable when the included glass, finish, hardware and work are clear.
Check the complete package.
Assess the windows with adjoining doors and façade systems. Ask how finishes, thresholds and installation responsibilities will be coordinated.
Explore Aluminc aluminum-window families and the performance glossary. Send your priorities so we can review a suitable aluminum option.