If the motor is heating it up that much... that isn't good. That'll cause HUGE fluctuations. Say... your house gets to 85 or 90. that's 8 degrees to 4 degrees difference for your tank and your house right now... 82 becomes 93, and 94. Plus take in mind more bodies in the house = more heat for the house, less bodies = cooler house, plus sunlight, breezes, baths/showers, etc.
Here, night can be 77, then days for summer can be 110!
Here, night can be 77, then days for summer can be 110!