Change the air in your house if you can. It will increase the quality of air in the house and will also reduce the humidity build-up. Here is a link with some information that may be useful.
http://www.cmhc-schl.gc.ca/en/co/mah...inaiqu_009.cfm
My place is quite new and it has the full ventilation on one switch. When I started using this in the winter the frost on the windows pretty much disappeared and never came back.