just beginning some finish work on a porch we added on. i found the article on building a window seat in the nov issue.  we decidied to make it a little wider to accomadate an extra bed when required and use the room below for extra storage of bedding etc. my question is how much humidity and mold problems may we encounter as the location is on an outside corner wall. will we need venting and will that do much good as our house is heated mainly from the wood stove that will sit just a few feet away. we live in northern alberta canada and the temp can end as far as -45C. so cold areas can become problems. Any experience with these would be very helpful.