Just started diving dry and have been in temps of 45 degrees and intend to keep diving during the winter (Northeast) and cooler waters. While comfortable, toward the end of the second dive I do start to get a little cool but I'm still comfortable. Anticipating I may be diving in cooler waters or extending dive times, is it worth using argon and does anyone have a guesstimate as to how much warmer it actually keeps you. I couldn't find a thread, blog, or site that actually addresses the temp difference in a dry suit using argon vs. air. Just trying to figure out if it is worth the cost. Thanks.