We were in room 253, 254 and 256. It was directly ...

We were in room 253, 254 and 256. It was directly next to the industrial air conditioning units that made a very loud noise continually and had a high whine that could be heard inside the rooms above the normal airconditioner. Walking along the outdoor passageway to the rooms, wasn't a calming, quite experience, it was loud and annoying. We had trouble staying asleep and going back to sleep because of the high whine from outside.