It's not just older ones, but some newer ones have very little insulation to heat up the "boxes" we live in.
We have dual shades, plus curtains over dual-pane windows. I keep those closed on the side the sun shines. Then close them all by later afternoon, since the heat still radiates inside through the window. Also, we use table fans inside - one in BR at night and one in LR during day.
I only adjust the thermostat a few degrees during the day. 71 at night and 72/73 during day so I don't get too cold. Luckily, ours is well insulated, so the AC's don't stay on constantly, especially if we're under a few large trees like now in SE OK.