We're running some energy model iterations for the Bowen Island passive house.
High heat gain IGU > 16.1 (kwh/m2a)
Using the suspended film IGU from Litezone we're at 15.2
The standard glass has a bit better visual clarity, but much more overheating
Super-Thick Glass Makes High R-Value Windows Possible Canadian manufacturer LiteZone develops a spacer system for windows that achieves R-values up to R-17. trib.al/yhs9UIn