What the guy said about 20 deg drop in/out of unit is about what most ac units can deliver. If its super hot out and sitting in sun, makes the "in" temp higher. That said, we have 27bh and live in Houston where its plenty hot and humid and it will cool it down to where I will stay outside as the DW has it too cold. You should also get a blast of air from ducted vents, but be aware the unit has also vents you can open/close blowing air out from where it has the intake, if you don't close most of them the bedroom vents and such won't blow very hard.
New to me 27BH towed by 4.6 Tundra