what up spunk?
your gonna need to give me a little more detail to get an exact answer....
How many lamps are you using? are they hooked up to cool tubes?? how many degrees does it actually get during light cycle and when its off?.....
You should not get rid of them and start over....
i would keep em and fix the problem... if you are already that far in flowering just keep going and try and make the environment better.....
there are many ways you can go about bringing the temps down.... without spending too much right away...
first try adding an air intake..... from the bottom of the grow room... make sure it is bringing in fresh air from somewhere with good temps.. (eg. the room next door or fresh air from outside if its not too cold)
if that didnt help; maybe a bigger fan or just another small fan....
third if your lamps are not in cool tubes, get some and hook your extractor to them in order to get rid of the hot air produced from the light bulbs......
If all that didnt work then invest in a bigger extractor... (exhaust fan) .....
i had the same problem..... and did all these things, one at a time hoping to bring the room to perfect conditions but each individual solution i tryed helped but not enough... so i ended up with a new intake fan, an new extractor, (already had it all hooked up to cool tubes) added a bigger fan for air circulation, and used the other one to aim straight for the light bulbs.....
finally i added co2 to the grow room because plants who receive more co2 than that which is already present in the air can take hotter temps, and more humidity... obviously along with that they eat up more fertilizers...
so there you go ... i gave you every possible solution i came up with for my self....
depending on what your temps are, what humidity you got, and the amount of plants per m2 youll manage to tweek the enviro, with each step until you get what you want... or more like.. what the PLANTS want
good luck, and dont give up on this round... your already half way through the flowering....
In the worst case scenario, they will just have more cbd than thc.... which may give you a bit of a head ache... so if you dont like it sell it off... and buy new stuff... or do what i do ... exchange it for something different with someone who really liked yours....