Yeah it should never realy matter how hot it gets. As long as you have good airflow and the plants good amount of water.
LOL in here in aussie land
we can have 40+ degree cel heat waves outside so without a air con for a indoor grow it would be a death sentence
.
Right now there is no heatwaves and my temps are about 80-97f(NO AIR CON),about 78-87(WITH AIR CON) at night with the lights on. But the plants do ok and always have.
I reakon that when mj plants suffer from heat badly and die it's because they where not made to be grown in that hemisphere of the world ie:To hot,to cold.
But thats what i think anyway
correct me if im wrong.