Should I get a dehumidifier?

I live in Portland, OR, and it gets kinda humid in the winter (70-80%!) but only around 60% in the summer, so I was wondering if I should get a dehumidifier for my chin? I haven't had him during the summer yet so it'll be a test. He seems fine with the higher winter humidity at the moment. The temp around his cage is usually around ~65F.

I have an window A/C unit and am wondering if that'll be enough combined with a ceiling fan set on low to get the air moving? Summers can get pretty hot...

Should I get a dehumidifier?