I just read this on the morebeer.com website:
Is this the case with all regulators or just theirs?Regulators work best at room temperature. If you must use your regulator in the cold it will take up to 4 hours for the adjustment to register. For example: If you are at 10 PSI and you change the pressure to 12 PSI the regulator will move to 14 or 15 PSI over the next 4 hours. Once you have found the correct pressure the regulator will work perfectly fine but it will take some trial and error to get it adjusted.