The owner's manual says it may run for 24 hours to initially cool. Ours ran for 6.5 days without shutting off all the while making an oscillating groaning noise. (Room temp is 73-80.) Then it ran normally for ~24 hours - gentle whirring noise cycling on and off. The noise is back today. I am not confident this thing will last. Minimally, the owner's manual should say it takes a week, not a day to cool. It should also say the oscillating noise is normal... if it is normal...