The body has ways of generating heat. If they do not turn off fast enough when the A/C fails, you get hot. It is entirely possible that this device could help elderly people in A/C failure, by forcing their bodies to adapt to variability instead of constant cool air.
Likewise, sudden heat will cause the skin to flush and draw a great deal of blood[1]. This imposes a greater workload on the heart and results in shock if the heart cannot keep up. Constant exposure to heat, as with this device, should force the heart to gradually strengthen as the hot season builds, increasing heat tolerance. Likewise, variability should strengthen the heart.
[1]If you ever have to enter a machine room with failed A/C, where the heat index is above body temperature, bundle up in heavy winter clothes over your whole body. Otherwise a runaway flushing response will draw heat into your body and kill you.