Maybe a brave Denner would be willing to do a two part focus: First 30 days with cold water, second with hot. Subject will only be allowed to use straights honed with fieldstone, and turn of the century carbon steel DE blades with at least twenty shaves on them. Both types of blade will be allowed to be stropped on whatever tack leather they can find available on hand.
Too complicated. How about are a hot towel on one side and use cold water on the other side. Then shave.
I often wondered how many cold water shavers are actually from the north? I always found it difficult to use cold water when the mercury nears the bottom of the bulb
I just can't. Or very seldom. When I work in the winter, it is outside. When I have spent all day in -15,-20,-30 degree temps, sometimes it takes me hours after I get home to feel like my core is warmed up. Those are the evenings when a hot shave is such a luxury.
When I started out shaving, I used warm water for shaving, but my face became very irritated and I had to stop shaving for a while. Then I started using cold water and sometimes even water with ice cubes in it and my face feels much better and I can shave every day without problems.