I have very different results than yours though. I set my aircon at 29C & on the fans in all my tanks. My 3ft tank will reach 26.2C & both my 2ft tanks will be 24.6C & i have a 45cm tank with a 24C.
So, i was also wondering is it lesser water volume temp drop faster? Also if this could save electricity bill as the aircon don't hv to run too cold. i think their location in the room is also critical as well as the volume of the water. However, i do turn off the aircon & leave the fans on at night for abt 8 hrs & when i wake up the temp in the smallest tank will raise the most to 26.2, same thing for both the 2 ft tanks(they are on the same side of the living room).The 3ft tank however is higher at 26.7C. No tank is near any heat source or sunlights. I am also quite curious? I just started this aircon + fan thing 3 wks so far & still waiting to see the electric bill.
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