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Thank you everyone for your help. I determined the issue with my model. The walk-in cooler and freezers had incorrect inputs for the U value of the walls and doors of the walk-in. I believe this incorrect U value carried through from my OpenStudio model. Essentially the U value was very high (~400) instead of 0.04 like it should have been, so it was causing an almost infinite cooling load. This was tricky to see because the input comes in as 4+02, but should have been 4+-02 which is difficult to realize right away. I do think there is an error in how OpenStudio translates this input, so I will be aware of this in the future. Thanks again for everyone's feedback!