Regarding condensation on windows, is it better to have your drapes or shades open or closed? What should be done in the winter?
Keep the curtains or shades open so that air circulates and warms the glass, even at night. Cold glass means more condensation.
But glass is only half of the equation. High indoor humidity means more condensation. So tackle the other side of the problem:
• Operate the kitchen exhaust fan every time you cook. Make sure the fan actually blows to the outdoors and doesn’t just recirculate.
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• Operate bathroom exhaust fans while bathing or showering and for 15 minutes afterward.
• Do not vent the clothes dryer to the indoors.
• Use a hygrometer (available at hardware and home stores). The colder it is outdoors, the lower the humidity level should be indoors.