Closing in the atrium makes a HUGE difference, in terms of usable space inside.

We have always had the front and back doors open, so that air can go straight through the house. Perhaps you didn't do that? With the doors open, we found it pretty comfortable in the living room without the a/c on from the 15th to the 26th. In the mornings, we would get up and open the back doors immediately, and not the front door until later, and we always found it to be much cooler once we open the front door. We would generally not turn the living room a/c on until late in the afternoon. I'm not exactly sure when they will have all the units done, but I have to assume it will be definitely before the end of this year.