Sorry if I am repeating myself. We are in a 40-year-old house. Our bedroom window faces south with a heat vent underneath the window. We have a cold air duct behind our dresser which is moved about 12" inches from the wall to let air flow. As the temperature is getting colder we find a little condensation on the window. The window is aluminum sliders and it is double pane. We leave the blinds up a little so that air can flow during the night. When we wake up in the morning a little condensation is dripping. At this point it does not appear to be that much but as the temperature drops we are afraid that more condensation will appear. What is your suggestion to help solve this dripping problem because the condensation is dripping onto the wood frame? Hoping to hear from you.