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>Only downside I know of is that I'll sometime feel too warm when I get in the office, as the metabolism goes overboard a bit.

This and picking the right shampoos and soaps at the beginning. It's hard to them "foamy" in cold water, especially during winters when tap water gets even colder. My usual 10 min baths went to 20 with cold water simply because of it.

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This is why I start my showers luke-warm and then go cold. My hair is medium-long and really thick and I just cant seem to make any progress washing it if the water is too cold.

You don't have to have cold showers everyday. I default to cold, and when grimy go for hot. You only really need to soap the places where the sun doesn't shine. And your hair doesn't need shampooing everyday. But each to their own.

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