Hi, I have identical insects in my home appearing in similarly warm weather..I issued a post before I found your thread can I ask how you treated the problem please?
Nothing has worked so far- they are back again and the hot weather makes it worse. We tried something from Rentolkill that's supposed to kill all but didn't work. Sorry. I'd love to know the answer myself!
I rent my property so left it to my landlord once I'd identified it. Just went back to my research and it says that the most effective treatment is to remove all the damp wood they feed on. They will not attack sound wood.