Need help with summer coming

I just got my little guy and he seems to be settling in nicely. I live in New York and I was wondering about humidity levels when summer rolls around. My house doesn't have air conditioning (we only use fans) and in NY it can get quite humid sometimes, kind of like drinking water out of the air. I was wondering if this could potentially cause a problem for my cham? Is there such a thing as too much humidity?

Definitely such thing! To high of humidity constantly can cause a respitory infection.

How do I prevent this in the summer?

I would get a smaller fan for the room he is in and just have it running during the day to keep the air flowing throughout the room. If that isn't enough, you can always get a dehumidifier.

I don't know much about chams yet, but I do know about hardware! We sell several varieties of dehumidifiers from single room sized units to whole house units and I'm sure your local hardware store would have the ability to get similar things if necessary.

What species of Chameleon do you have?