I have sit or stand desk at work and home. Standing is hotter. If I want to cool down I'll sit for a while, once I've cooled down I'll stand the desk back up.
Its even more awesome in a building with broken AC, but having a good desk fan pointed at me all day helps a lot. I do find while the building temperatures rise during the day I'll sit more to stay cool. Conversely in the winter when my computer room is freezing I'll stand to keep much warmer.