My 150 square foot bedroom has central air and stays around 80 degrees F (sometimes a few degrees more or less).
8,000 BTU Results
I purchased a Frigidaire 8,000 BTU unit from the Home Depot to cool the room. It is able to keep the room at 68 to 72 degrees F and runs constantly (I have it set to 62 - it occasionally switches to fan only mode to let the compressor rest).
10,000 BTU Question
I would like to cool the room more and remove more humidity. The Home Depot sells the same series model in a 10,000 BTU variation. If I upgrade to 10,000 BTUs will I see a difference? I would like to get the room to stay at 64 to 68 degrees F at 50% or lower relative humidity.
I am guessing that the 10,000 BTU model will also run constantly (occasionally going to fan only mode) as it will never be able to reach the set temperature of 62 - I am fine with this as I am replacing my old unit which did the same thing and lasted for 8 years.
My understanding is that portable air conditioners have overrated BTUs as they are no where as efficient as window units because the compressor is inside the room.