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Very much depends upon tank position in the room of course! Being near a window in the sun will obviously heat the tank, being near an open window / door / fan will cool it. Tank size (water volume) will determine how stable temp's are throughout the daily cycle - the bigger the more stable. But tank proportions also matter - shallower tanks have greater water surface area and hence tend to be cooled more by evaporation. Depending of course whether your tank has a lid or is open topped. So many variables, but still probably on a degree or two variation away from room ambient temp. in most cases I would guess.
