Windows for Passive Solar (continued): Serious, Thermotech, etc.
I am selecting windows for a house in Portland, OR, a marine climate. The heating demand is not extreme but it is a heating climate, and this is a passive solar design. There are no plans to include A/C. As has been discussed a few times on this website, it’s hard to find a domestic manufacturer of windows with a good U-value and high SHGC. The recommendation from Martin Holladay is to choose Canadian windows, e.g. Thermotech, Inline, Accurate Dorwin. A few people have chosen to import windows from Germany, at higher cost.
It would be ideal to source windows from a company nearer than southeastern Canada (or Europe). Serious Windows is on the west coast, but my instinct is to avoid suspended film glazing. The warranty has a lot of exclusions and doesn’t specifically state that the film is guaranteed not to cloud or yellow. By comparison, the warranty for Pella does specify that their glazing will not cloud for 20 years. Of course they don’t seem to offer a high SHGC option.
It seems the manufacturers need to be badgered into offering different glazing up north. Any ideas about this?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part