Sorry fot the double post but I forgot to add.. A cold snake will not move much. They also cant properly digest the food they eat. They are in danger of getting sick fromma respiratory infection or food rotting in the stomach because it is not warm enough to digest. You ask if the snake is sick. If it is you would see signs like excessive yawning, making weird noises like raspy, clicking, bubbling, gasping or hissing for no reason. Star gazing where they sit with the head pointng upward for a long time. Fluid coming from the mouth.

If it shows none of these signs then just get the heat up to 90 hot side and 78 to 80 cool side. Humidity around 60%.