I love these portable units and have 2 - 10K BTU units in my lake house. I added a 14K to the mix at my primary home simply to use in our master and not have to run our central air all night just to keep cool. It's not bringing the room down to temp as quickly as our other units and our bedroom isn't much larger than the bedrooms at our lake house, so 14K BTUs should cool quickly a single bedroom.

I'm not sure if it's the unit, but it isn't performing like ones purchase last year for other bedrooms. 14K BTUs is a lot of horsepower and should cool a lot of space to temp quickly. It's doing a good job, just not as rapidly or efficiently.

BTW my 10K units get a 5-star rating.