this probably just means you have moisture in your vehicle. try leaving a small heater in it overnight with the window open about a 1/2 inch, should be fine after that. Your car shouldn't have moisture in it unless there is a leak somewhere. Possibly in one of the window seals, which have caused Subarus some problems in the past.
The 2014 Subaru Outback is 5 ft. 11.7 in. (71.7 in.)1 one-touch power windows wide.
The 2003 Subaru Outback is 5 ft. 8.7 in. (68.7 in.)1 one-touch power windows wide.
The 2008 Subaru Outback is 5 ft. 9.7 in. (69.7 in.)1 one-touch power windows wide.
The 2007 Subaru Outback is 5 ft. 9.7 in. (69.7 in.)1 one-touch power windows wide.
The 2011 Subaru Outback is 5 ft. 11.7 in. (71.7 in.)1 one-touch power windows wide.
The 2004 Subaru Outback is 5 ft. 8.7 in. (68.7 in.)1 one-touch power windows wide.
The 2012 Subaru Outback is 5 ft. 11.7 in. (71.7 in.)1 one-touch power windows wide.
The 2013 Subaru Outback is 5 ft. 11.7 in. (71.7 in.)1 one-touch power windows wide.
The 2005 Subaru Outback is 5 ft. 9.7 in. (69.7 in.)1 one-touch power windows wide.
The 2002 Subaru Outback is 5 ft. 8.7 in. (68.7 in.)1 one-touch power windows wide.
The 2006 Subaru Outback is 5 ft. 9.7 in. (69.7 in.)1 one-touch power windows wide.
The 2010 Subaru Outback is 5 ft. 11.7 in. (71.7 in.)1 one-touch power windows wide.