I'm having the same issue with window fogging here in the Pacific Northwest. This afternoon, I remotely turned on the climate control, 10 minutes later, all the windows were steamed up and the interior was like a steam room - temp was set at 70.
So after I unplugged and got into the car, I had to manually defrost using valuable juice even before backing out. Well, I did back out first cuz the camera did not fog up!
This is the first serious hinderence I've found in the LEAF since June when I brought it home. What happens when the temp drops to our normal 36 daytime??
I hope that Nissan built in enough programmable functionality to resolve this in the future.