The Homeowner's Guide to Double-Pane Window Condensation: Interior vs. Exterior vs. Between Panes

## Decoding Window Condensation Seeing water droplets on your windows can be alarming. However, where the moisture forms tells you whether you have a simple indoor ventilation issue or a broken window seal. ### Location 1: Condensation on Interior Glass (Inside Your Room) - **Cause:** High indoor relative humidity (from cooking, showers, humidifiers) contacting cold glass. - **Solution:** Turn on bathroom exhaust fans, lower humidifier settings, or open window trickle vents. ### Location 2: Condensation on Exterior Glass (Outdoors) - **Cause:** Dew forming on cold outer glass during clear, humid mornings. - **Diagnosis:** This is actually a positive sign! It proves your Low-E coating is blocking indoor heat from escaping to warm the outer pane. ### Location 3: Condensation or Fog *Between* Panes - **Cause:** The hermetic seal has ruptured. Moisture-laden ambient air has saturated the internal desiccant. - **Solution:** The insulated glass unit (IGU) must be replaced. Contact ServiceFind Windows Pro to replace fogged glass panes with our **Fair Quote** pricing standard.