Temperature bud (THC) levels get affected?

Hi, new to boards, I searched for the answer to this but couldnt find it. I know that a low simmer of CannaButter is optimal to not harm the THC content, my question is what temperature does affect this? I've heard of people boiling the butter before adding the bud but only simmering for 10-15 minutes?

Anyways, I'm asking because I want to use my cannabutter to make weed caramels. But I have to bring the sugar/budder mix up to 240° Is this too hot? I don't want to waste any to attempt to find out, so let me know!

I try to keep the simmering at about 200 degrees. And if you're making brownies keep the heat on the low side of the recommended heat. When heating into butter or oil(I use canola oil) Most of the thc stays trapped in the oil, so unless you're boiling the oil the thc will stay in the oil.