[shergry]

We had this problem on the coast of SC. The only thing that really cut down the number was putting (what I call noodles) under kitchen slide and bedroom slide. These are fiber filled tubes (usually used to keep cold air out), we also put them up the bedroom slide if it fit. Never forcing, just gently pushing. Had to remember to remove when getting ready to go, they are so soft would not really hurt anything...just did not want to make more.
Once we put these in the number decreased dramatically. Also, have put a floor fan in the door way; turn on when opening the door to try and keep out any hanging around the door.
The noodles not only help keep out the cold, but really help keep out the heat of summer, also.
Just a thought..we are happy with them.