Windows are getting installed, and the upper roof is getting sheeted! Progress!

The windows are Marvin Ultrex dual pane Low E3 Argon, which have less than 5% UV passthrough, U Factor of around 0.25-0.27, and SHGC (Solar Heat Gain Coefficient) is around 0.30-0.35.

A .25 U factor is pretty good given the large number of windows and the climate in Portland, which isn’t particularly cold. It is possible to get down into the 0.17 range, but at almost double the cost.

It is also tradeoff using a windows with low SHGC, as they are better at blocking solar heating in the summer, but also block some solar heating in the winter. Fortunately it is never sunny here in the winter!

https://youtu.be/HcTQm7y2PwA