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Lighting can do it. The tank's lights or even room lighting can heat up the room enough where the tank starts to warm up.
If your tank is upstairs heat does rise.
If your house/building is brick. It will retain the heat then leach it into the house.
Heaters can be bad from the box. (Need to return 2 myself) Or it can be a bit to chilly and the heater thinks it must come on.
A fan can help, make sure it's an oscillating one. That way it moves the room air, not just in one spot.
Our problem is our basement. My boyfriend is a computer geek and runs his own servers. Our computer room is always about 90 friggin degrees. So the entire basement is about 85. Even with the AC set at 73. Plus our house is brick. When the sun starts to go down the house heats up.
Even running your AC, keeping the house at around 70 there are many other factors to consider, like those above. When I'm setting a heater I put it in a bucket. Try that, see if you can't get it to just below the temp you want then put it in the tank. See if that helps keep the water just right.
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