Drying temperature question

So, I have an infestation of whitefly. Its not too bad, I've spotted about 10-15 of them. I am nearing harvest time, 7 days, give or take.

I know that when the bud starts to dry, they will slowly die off. I want to kill all of them off.

What is a good low temperature to dry my bud, while killing off the flies. I can drop it down to 5c.

I wont start my next crop until I know they are done for good. No food + cold temp will hopefully kill em off.

Thanks in advance for advice .