I have been hearing a lot about house wraps and houses being built too air tight. We have a lot of condensation in our upstairs and the humidity level is 50+. Our house is about 8 years old and is "house wrapped". We live in Central PA. We also have a lot of water on our windows when it is cold outside. How do we know if there is a problem and if there is a problem, how do we fix it? I want to be sure that we are safe in our house and avoid future problems if necessary. Thanks for you attention to this concern!