heat stress and can i save it ???

[The Equinox]

I have a few plants under a 400 all was well till it got to warm i asume whitch lead to the tops of a few plants started to curl into its self as is showen in the pic this is the worst of the lot the temp is 21 but i may have been hotter befor i fixed my thermo
Can i save these plants or is it heat stress can it be something alse
Also it seems straing that other plants in the same cubord are not showing signs ???

Are my plants heading to death

[Ganja Guerrilla]

yes they will survive

put a wet towel in front of your fans to raise the humidity for a few days and mist the plants often for the next few days , some of the leaves may not repair themselves
but dont remove them unless the are 50% or more damaged

& maybe raise the lites ?

[The Equinox]

have started to do so raised the light already is 24 to hot ????? on a hot day like today stoping it from getting that hot is hard unles i had a cooling fan may also need a bigger fan whats the chances of servivel

[Ganja Guerrilla]

no worries the plant will survive

24-20C optimum temps, but airflow is important the higher the temps