I've been alternating between hot, lukewarm and cold water shaves, lately. Somehow, I get the feeling that a cold water shave requires a sharper blade, which is scientifically nonsense as a hair assumes skin temperature which does not vary a lot. I really like the skin feel after a cold water shave, and I really like warm water on my face. And when my girlfriend is taking a shower, I use cold water so that she doesn't get angry with me

To end the rambling with something sensible: try it.