We bought our unit just before we were married. We turn it on during afternoon naps and during the evenings, just to cool the room.
The problem with this airconditioning unit is, it cannot cool the entire bedroom, which is actually very small. We have to turn the aircon to the coolest setting and have the vent directed to us. And not only that, we have to have the electric fan turned on just to augment the air that is being given out by the aircon.
It is really a waste of energy. I wonder if we should have bought a higher capacity aircon or we should have opted for a different brand. It is really not worth it.
And by the way, it is only a year and one month old. So it is really not efficiency. I regretted buying this unit.