most likely he will go up. check anywhere high up that is warmer than the rest of the house. on top of the refridgerator, on or under the light on the stove, on top of cabinets, on or in any lights. wait until it is nighttime for better chances of catching him out and about. you could leave some babyfood in his favorite flavor in a dish on the fridge and see if that attracts him. he has probably been sleeping all day today and will wake up soon and start to explore. keep the lights dim and see if you can spot him galavanting about. good luck!