I am experiencing the same issue. Both BP's are staying in their cold hides. I am only running RHP's and no belly heat. When I shoot the floor of the cage on the hot side, it reads 88-91° and the top of the hide reads 92-94°. Cool side floor ranges between 79-80° and the top of the hide reads 81-83°. So I think my temps are spot on. They may be a little high, so I may try lowering the thermostat by 1 degree. I am also going to try switching the hides around tonight to see if that makes a difference. Perhaps they both have a preference for a certain hide, but the hides are identical on both sides of the tank.