I live in Pennsylvania, and my current car has a sun roof. In the winter, cold air oozes from that glass panel with ease, and its only a sunroof section of the roof, not the entire roof. This would worry me that there would be a significant amount of additional energy used in keeping cabin warm through winter drives. I think this would be amplified in colder climates such as Massachusetts, Canada, etc. Anyone else have a slight concern for this too?