Your property most likely is well insulated. Mine isn't. As soon as I turn the ac off, the cool disappears. Oh well, what would I do if I dind't have something to whine about right?
The fan is scheduled to be delivered today "by 8 pm" but of course, the post office isn't open after 12 so I'm out of luck until Monday.
Your PO doesn't deliver on Sundays? I sometimes see our carrier driving around on Sundays. I think they just started doing that this year.
As for insulation . . . I have no idea. I have an evergreen behind my deck, which faces on the south/southeast side, so it blocks a lot of the sun. That's great for keeping my place cooler in summer, not so much for letting the sun warm my home in the winter since it keeps its needles. The issue I have is that a unit on one side of me is vacant, so there's no one there heating/cooling it. So my heat (in winter) or a/c (in summer) seeps through the wall to go into the other unit. And now the unit next to THAT one is also vacant, so there's no one on the other side to help heat/cool it with me.
Oh well, not much I can do about it.
I hope your fan comes soon!