I did a bit more research on silica gel and it is not true that it is releasing humidity when heated above 35°C, as stated on the Ukrainian forums.
It only desorbs moisture when heated above 104°C, see for example
here or
here.
However, when heated above 25°C it will adsorb less moisture. There is a graph
here showing the adsorption capacity vs temperature. The capacity drops from about 22% at 25C° to about 18% at 50°C.
So, heat in the case is not really a problem unless our case gets to 100°C
