There seems to be a lot of vent mounts for ipods/iphones out there, but I'm wondering if anyone has any advice on what seems like an obvious inherent problem with using them. In the winter, you could be bombarding your device with a rush of really hot air. This can't be good for the device. And less problematic, I would think is bombarding your device with A/C in the summertime. Does anyone have any thoughts on this? Is it a non-issue, or do you need to watch out for these things?