It is quite hot this weekend and I noticed for the first time that the Karma is much cooler than my other car (Audi). Both are sitting in the sun and both have black leather inside. The Audi is like a hot oven. The Karma is still warm inside, but a lot less. On the outside I can hear a small fan running, which is blowing the hot air out. Proof: I can smell fresh leather outside, which is how the inside smells. The car is not plugged in and not losing range, so the fan is running on solar power alone.