Obviously this requires a lot of work and could still make the house feel uncomfortable.The recommendation we almost always make (and one no one wants to hear due to the $$$) is to Install/add a larger HVAC that can adequately circulate the air throughout the home. 

If it's the windows, all they have to do is wipe them once or twice a day, keep the blinds/curtains open so air can circulate, and ventilate the house at least once a day for 5-10 minutes to reduce excess moisture.Mold is not as bad as people think and is usually easy to deal with.

That was one of the worst winters we have ever had, and you can do some small things to improve circulation of air to your pipes.

Water leaks through the granite fieldstone foundation, but drains well and dried quickly due to good air circulation.

There's a related petition circulating right now that I've signed that I think a lot of Chicago people on BP would support: https://www.change.org/p/chicago-city-council-re-legalize-coach-houses-and-similar-accessory-housing

50 degrees is a good temperature for a vacant unit if you have forced air heat circulating.

If this is a hot water circulating system and if the lines and boiler were drained, you might have a few breaks, but not a disaster--no flooding because all the utilities would have been turned off. 

In just 20-30 minutes per day, you can get moving, get those creative juices flowing, improve your circulation, and boost your energy.

The circulator pump wasnt working .

Did someone replace the circulator pump?