Condensation is a problem many homes are dealing with, building up on the inside of the windows and creating humidity in the home as well as humidity and moulding and ponding on the sill of the window, all of which can cause breathing problems over time.
Heating and ventilation to allow moisture-bearing air to escape outside is the best condensation treatment. Heating the room helps to keep the surfaces above the dew point, while ventilation helps to expel warm air from the outside.