I had an opportunity to take some temperature readings. I took the temps after the generator had ran for a couple of hours. We had a pretty good load on it the entire time. We had the 15k AC going along with the TV and the converter charging the battery. I used a wireless indoor - outdoor thermometer to take the temps and all are internal.
Outdoor Ambient: 85 degrees
Location #1 - 97 Degrees: This is the location in front of the left fan. Also where my kill switch is located.
Location #2 - 110 Degrees: This is the location in front of the fan on the right. The exhaust blows into this fan.
Location #3 - 86 Degrees: This is the air intake side of the generator.
Location #4 - 89 Degrees: This is the temp on top of the gas tank.
Here are a few pictures of the box.