Relax. He'll be fine as long as it didn't get into the 50's-60's. Even then, if he didn't have a full stomach, he could handle a wider range of temperatures. The reason he didn't move is he was probably still comfortable at the cooler temp. Just because they have the option of a warmer area doesn't mean they always use it.

As for the noise, it may have just been a hiss. I don't own balls yet so you may want to wait for a bp breeder/owner to answer that one. I wouldn't worry too much though if he's eating, isn't showing signs of labored breathing, and has no discharge. Since he only does it when you pick him up, it's probably just a startle/behavioral reaction.