If they are like the WDW resort motion detectors on the AC units, I have a potential solution:
Every day, just before you get ready for bed, press a simultaneous combination of temperature up or temperature down and the power button on the AC unit. I can't remember the exact combination, but there's only 6 or so different combinations of simulatenous buttons to press. In our case, I thought it was temp. down and power.
Anyway, when the right combination of buttons is pressed, you should see "bp" on the display, meaning "bypass", and you can raise or lower the temp. as well. At WDW resorts, it seemed like this allowed the AC units to bypass the motion sensors for about 24 hours. So I just did this process once each night right before bed. We never had the heat buildups overnight after that.
Hope this helps.