u/AlternativeSlow2768

I have a huge any infestation that I think runs under my whole house, and it has been a problem for years. I recently learned that they feel pain, and now I don't know how to humanly get rid of them as they keep coming back. Before I was using boiling water when I found the nurseries, and it seamed to work a bit, but I don't want to cause suffering to them. Is there a quick, relatively painless way to kill them? I don't think they will leave naturally, as my house is old and is not sealed properly. Any advise would be greatly appreciated