To stop condensation on windows, improve ventilation in the room to reduce humidity levels. Use a dehumidifier or air conditioner to help control moisture. Ensure windows are properly sealed and insulated to prevent warm, moist air from reaching the cold window surface. Regularly clean windows to remove any condensation build-up and consider installing a moisture barrier or upgrading to double or triple-pane windows for better insulation.

Stop condensation on windows by improving room ventilation, using a dehumidifier, sealing and insulating windows, and regularly cleaning them. Upgrading to better-insulated windows can also help.