55% is high humidity. I panic when I hit 45% humidity and try to always keep my humidity at 35%. If you start getting higher humidity like that, you may start battling fungus, and trust me, that's a crappy battle.
The battle with the dehumidifier goes on here every summer. If you are running a/c in your room and keep the dehumidifier away from the chin cage, it should help without making it incredibly hot. A/C's are just not even touching the humidity out here this year. We've been running humidity over temp all summer long and it's miserable.
Mommyslittlechins - I may be misreading, but it sounds like you don't have an A/C for your chins? Are you saying that 55% is fine, but if it goes higher get an a/c?