Oct 17, 2013 - 11:33 AM
When treating for german cockroaches it is essential that you treat the areas where they are hiding and breeding. You mentioned that they are in the range. What have you done to treat the range? They can get inside the insulation and under the top. So unless you have treated inside the stove with your products, they are probably living there.
Placing it outside will not kill them. They secrete an antifreeze protein that will help them to survive cold climates. Unless it is subzero for a long period of time, the cold won't bother them.