I have a 1952 bungalow with hard wood floors that are freezing cold all winter is it okay to close off the vents in my crawl space to help reduce cold air from outside. I have read that by doing this I could have moisture problems considering I live the in the Pacific NW. Another option I had considered was insulating the floors from below by I have heard that this could cause issue with pipes freezing because it would prevent warm air flow from the warmer house to the crawl space and I could have frozen pipes. A third option is to put down a heavy vapor barrier over the earth floor in the crawl space to prevent moisture then close outside vents and then insulate the whole thing walls and between floor joists. I have no idea which one is the best idea for my old house or what potential problems each could cause any help would be appreciated I would like to get this done before winter.