Before the temperatures outside even hit fifty degrees, I had hornets flying around my reading lamp at night. They were freaking me out! Eventually, I saw that there is a gap between the screen and the window frame in my art studio. I had been opening the window every day for ventilation. Lucky for me, I had a roll of Duck Tape handy. I stretched it across the gap, and, no more hornets! It's up to my landlord what to do about the gap, but that Duck Tape is staying as long as I live here.