If your temps are still in the mid 90s and the florescent tube is still on, it is likely your tortoise will be hiding out somewhere trying to escape the heat of the day, so yes, in theory, you could turn off the heat bulb.
Sorry for the paucity of info. Your situation is just not typical, and few, if any, of us have experience with trying to keep an enclosure if this sort in a hot garage, in the south, in the summer.
General rule of thumb for this forum: If you ask a question and get no response or inappropriate responses, you are asking something that no one has the answer to, due to inexperience (this case, I think), or its just the wrong question.
Sorry for the paucity of info. Your situation is just not typical, and few, if any, of us have experience with trying to keep an enclosure if this sort in a hot garage, in the south, in the summer.
General rule of thumb for this forum: If you ask a question and get no response or inappropriate responses, you are asking something that no one has the answer to, due to inexperience (this case, I think), or its just the wrong question.