I have 4 feeder mice in an aquarium that will be eaten off eventually, but in the mean time I need them alive! I feed my ball python live now after much debate with myself.

I understand that mice require cool temperatures, right? I have a digital probe thermometer in their cage that reads 75.5 right now, which is too high from what I've read.

I keep my mice in my room because we don't have a basement and the garage is not air conditioned; and with this odd warm-winter weather lately the temperatures here in central illinois have been pretty high for this time of year, 75 to 85 average lately if I recall correctly. We have air conditioning but it doesn't seem to be doing much. I have the cage placed directly under my window, which is open (with a screen) and a fan blowing by the cage. I've also put a large cereal bowl filled with water behind the fan to see if that helps (though I'm not sure if that acts the same as a humidifier, which would greatly hinder the goal I'm trying to reach... lol). Even with all this it's still not bringing the temps down

I am honestly not sure what to try next. I lost one mouse already in less than a day (the day before he was completely fine, I considered disease but I really believe it's the temperature). I considered a dehumidifier, but not sure if it affects mice the same as humans. It doesn't necessarily lower the room temperature but it makes us feel cooler.

Thank you very much for any help!! I do not want these mice to suffer any more than they have to (as in being eaten. haha).