94.7 is pushing it. I would try to keep it between 88 - 92 degrees 24/7.
75.4 is way too low. You need a heat source 24/7. If you are using a white heat lamp, leaving it on all the time isn't the best option. I would suggest you pickup one of these infrared heat lamps: http://www.petsmart.com/product/inde...AvailInUS%2FNo