If starting with a chilled body, or applying cold packs to it when it's hot outside, you may experience an issue with condensation.
Might I suggest just shooting stills (1 every 2 seconds should be fine) and using an intervalometer to avoid the overheating issue? You'll put more wear on your shutter, but the convenience might be worth it. Plus the recorded images will allow you to pan through the scene if you want, as the resolution will be much higher than with 1080p recorded video.
http://www.panolapse360.com/