I also notice I am suspiciously warm in my car under these conditions:

Windows closed.
Outside temp cool enough to not need the air conditioner.
Air conditioner is, in fact, off.
Recirculate button set to let outside air in. (lamp off)
Fan set to a low speed.
Thermostat dial set fully CCW - to the coldest, blueist setting.

When I open my window I am surprised how cool it actually is outside.
It seems under these conditions the car should just let unchanged outside air in, but something is warming it up a little

???

For the record I have about 2600 miles on my 2 month old 2004 HCH in Southern California.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.