It might be a silly idea, but that’s what I do with my weighted blanket when I want it to be a bit heavier: I fold it just over my shoulders, and leave it single on the rest of the body. It doesn’t change the thermal properties much, but it feels better. So you could try a lighter weighted blanket (10 or 12 lbs), folded on the shoulder. The problem is that lighter weighted blankets are probably not necessarily cooler than a heavier one.
Well it’s not “solved”, and they seem to be increasing in number, but its not like that became the “hive” (which I’m sure it’s not the right name for ants). Way way more cocoons are appearing and disappearing than the average amount of “nurses” shuffling them around. And crucially, while they walk around a metal beam inside, they don’t seem to care about my tomatoes and my plants. The feeling I get is that they are guests. I’m ready to regret my choice of not acting, but so far they keep behaving.