We visited a few weeks after the summer heatwaves, and with outside temperatures of 15 degrees we did not expect our room to be sweltering. We had to keep the supplied fan on all night, and kept the window open all night, but still the room did not get any lower than 25 degrees. We found it very difficult to get any sleep, and though we had booked for two nights, we could not face a second night in Room 116. We tried to get a different room at reception next morning, but nobody was there. Thinking they might have been called away we returned a short time later but still reception was unattended. So we left. We contacted Customer Service once we were home and asked why the room was so hot, but their response was to suggest we should have booked a Premier Plus room that had air conditioning. That was a disappointing reply, as it does not explain how a room with fan on full and with an open window is 10 degrees hotter than outside. Needless to say we will not be going back to Harrogate South, and are considering whether we will be booking any more nights with Premier Inn. We have been regular customers of theirs for many years, and have travelled all across England, Wales, Scotland and Northern Ireland, but this has been the worst experience with the company.