First off, I am a noob but I will relay what info I have picked up... even though you were picking up 70% humidity b4, you may want to check the device you are using as well because perhpas it has gone bad or is reading incorrectly (just a possibility). I have the same problems with temps and I spent much time measuring temps around my house as well as researching and I was able to find a perfect place. Some guidlines that helped narrow my search were that cold air is heavier and thus you want somewhere low to the ground. Rooms with tile and concrete are cooler than carpeted rooms. North facing rooms recieve the least amount of sun and are cooler... avoid south facing rooms. Windows allow the largest transfer of temperature to occur, so if it is hotter outside, find a room with a small window or if its cooler outside, find a room with a large window. Once you found your two coolest rooms, start looking for cabinets or drawers to get some temp readings as they are usually even cooler than the room and more stable. I am sure some people will recommend a wine cooler or placing the humidor in a igloo cooler as possibilities too. Hope I helped!