I have a 2year old goodman gmnt high efficiency furnace in my cabin in Northern Wiscconsin. When I purchased it the shop that is now out of business said that if I turn it off completely for the winter that there is a drain or drain pan that must be emptied so it doesn't freeze and cause damage. I looked by the drain hoses and couldn't see anything else that might have water in it. Is there something that needs to be done besides check to be sure the hoses are drained? Thanks!