Hey guys, my rubbermaid is up and running, but Im having trouble with temperature and pressure.. It was reaching about 101 degrees when I left it on

I think this may be because there is not enough pressure, and Air is seeping in thru the top of the Lid of the bottom rubbermaid
Do you guys have any ideas on what can be done to fix this? Maybe caulk or just duct tape?
There is a small fan that sits inside of it and points at the lights too

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