Are your
double-pane windows going through an emo phase? If moisture is running down the inside of the glass and/or you hear strains of The Smiths, you could have a problem.
Condensation and fogging between the panes of a double-pane, insulated window can be a pain, and it could indicate broken seals. (The hermetically sealed glass panes sandwich air or inert gases in between to provide insulation and energy savings.) While windows last years, some may experience broken seals later in life.
To restore your windows' energy-saving qualities, address the issue: Your windows may have long-term warranties, and the glass could possibly be replaced at no cost—verify your window manufacturer's warranty.
EHow.com lists three options: Replacing the entire window unit, replacing the glass and having it reglazed, or hiring a company to repair the seal on the existing double-glazed windows. In any case, addressing broken window seals can restore your energy savings and end your windows' melancholia.