The new windows are intended to provide a weather-tight, energy-efficient seal to make the property quieter and more comfortable. What you are most likely experiencing is condensation. Condensation occurs when water vapor meets a colder surface and transforms into its liquid state. Similar examples of condensation are steam from a shower fogging a bathroom mirror, or cold liquid forming water droplets on the outside of a glass on a hot day. The best solution is to address water vapor at its source by running bathroom and kitchen fans when using hot water.
