[tangentspace]

I see a guy with a shirt and tie, but no suit jacket. A few other people have long sleeve shirts. I couldn't speak for them as to whether they are uncomfortable and sweaty, but based on personal experience hiking with long sleeves to avoid sunburn, high quality shirts can be very breathable and comfortable at temperatures around 78-80.

I admit the possibility that this whole article is a puff piece meant as PR for this firm, and in reality they're all miserable inside but maintain a charade of happiness to hide from potential customers the fact that their heat chimney was in fact an engineering disaster.

The simpler explanation, which jibes with my personal experience as a longtime Seattleite, is that it's just not that big of a deal to do without AC here as long as its a relatively small building and you get the airflow right.