Tom, the answer is probably several things, but here's my take:
The 3.O CF is not an 8 series. It's an RM25xx probably, and they are designed to work well in warmer temps - unlike the SN rated 8 series. Also, generally speaking, the smaller the interior volume, the easier it is to cool.
"You can't buy happiness, but you can buy an RV. And that is pretty close."