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You will probably use a lot less air if you have a hood, especially if the water temperature is in the 50s or 60s. I will almost always wear a hood or hooded vest under my wetsuit, even in the tropics when the water is in the 80s. If you're totally claustrophobic, look for something that isn't overly restrictive and has a lot of stretch... Is a hood needed for Catalina?
I am from az and dive the Colorado river in Parker Az where it is 80 at 20 feet. I have a 7mm wetsuit, glove and booties. Is a hood needed for Catalina? I am planing on doing a dive with the Sand Dollar.
I always wear a hood. 5mm separate or a 5mm hooded vest.
Not so much for the cold, but to keep water from rushing in and out of my ears and keeps the hair in place.