damn. i bought all hitachi coz i heard btu is high.

yeah, its cool. But I dun know how the hour works. If I choose >1 hour, for example 2 hours, it'll be cool for 1 hour
and not cool for another hour. It seems like it cool for 1 hour if I choose the hour base operation. If I on it only (without
choose hour operation), it'll be very very cool at very fast speed. So i wonder if u choose hour operation. Maybe I duno
how to use hour operation.