© Photo: iStock Condensation occurs frequently throughout the winterCondensation occurs when the air inside a room is warmer than the surface temperature of the window. How to prevent condensation on windows1. Keep the room temperature regulatedKeeping rooms in the house at a regular warm temperature will stop surfaces from getting cold enough for condensation to build up. Keeping surfaces warm will prevent condensation from forming. This seal prevents condensation from developing and keeps the inner glass from getting too cold, so it could be a cost-effective solution to managing condensation long-term.