This is my first autumn and winter with having full time O2. I have noticed already that my hose gets stiff in temperatures below 50 degrees. Is there a way to keep the hose warm? I know I need to keep my face / nose and mouth covered when the temps drop down, but then again will the O2 get to cold too? I know this is a crazy set of questions, but that I would ask before I really need to know what I can do to prevent anything from happening (getting sick). Thanks all!