I've got an E facing wall in my family room. Ceiling is open to the second floor. Have two rows of 3 windows each about the size of a standard door.
It's a lot of glass. Low E. The sun that comes thru it destroyed a brand new leather couch set in less than 2 years.
This winter we had some cold days but the sun here in TX is strong. All the heat was rising and flowing into the second floor making the AC kick on when it was 30 outside.
I put in solar screens, $450 for all six installed on the outside. This type of material. Made a HUGE difference in the UV coming thru.
Room is a bit too dark for my taste.
In retrospect I should have opted for them to be built as roll ups on the inside. Wife objected since the upper 3 would have to have been motorized with a remote.