As previously stated it will take your animal some time to get comfortable in his new surroundings. Once he establishes the enclosure as his “territory” he will become visibly more active. That being said chameleons are not dumb animals and in most cases the animal will do what it wants. If it needs to warm up it will bask, if it is too hot it will move to a cooler part of the cage. Stress can force an animal out of its regular habits thus causing health issues. However, considering that your Chameleon is new to his enclosure, give him some time to come around, in time you will notice subtle changes in his behaviour.
Best of luck
Kos