Condensation

[Dogman]

I just did a search on this and basically came up empty. It appears this is considered an unusual problem. We are currently in Florida but have had cooler then normal weather the past week or so. Our windows are fogged up (not thermopane) and yesterday we found a considerable amount of condensation at the bottom of the bedroom closet walls as well as both walls along side the bed. In addition we found condensation on the walls behind the couch and the recliners from floor level up to around 18" or so. It was also wet along the inside slide seals where they contact the inside walls. The windows and vents have been closed due to the cool temperatures and the furnace has been working at night. Has anyone had a similar problem? I assume it's being caused by excessive humidity inside so now we have a window partially open but with the low temps. still have to run the furnace at night. Seems like such a waste of fuel. Anybody have any other suggestions on how to combat this problem?