I kinda had a feeling that it was your A/C unit... That's a small TT, so the fridge itself must just be a single door, under the counter unit?
I've got the bigger unit with 2 doors with the upper freezer..
Mine vents thru the roof and has the larger lower vent on the outside that you can pull off with just a couple of tabs.
I also run the roof 13.5k A/C when it's that hot out and I have electric hook up, so that keeps my inside temps in the low to mid 70's easily..
I don't mind using LP for the fridge 100% of the time when it keeps my beer cold! :) And yes, it keeps the rest of the food cold too... :)
Mitch