keeping it Kool inside the flowering chamber

[BUDsai Grower]

Ok. So I been facing the challenge of keeping it a good Kool temperature inside my grow closet. During the summer time it been getting hot inside the flowering chamber and I can't be leaving the door open. Came to mind to used a reusable icebag and place it behind a fan. Hey it's working.
I'm open to better suggestions.