I would pull the light up a bit, but I guess you need more extraction volume in there and that’s a big area for 400w.
The damages taken will be there but as they enter flowering new leaves are born and you can disacard the ugly ones.
This is the beauty of it, you need to find your way on your space, it is true it’s weeds and they grow everywhere but in order to have good yelds and quality you need to adapt and become a better and more complete grower.
First you should solve the temperature problem, and go from there.