My kitchen is an extension of the house. Most of its walls are outside walls. It's extremely cold in winter (down to 7 degrees celcius). Its unique window seems old too.
The problem is it's very humid, to the point that mold formed at several spots. Food inside cupboards has also been affected by the humidity. (for instance sugar is not powder any more but forms pieces).
Why is it so humid? Can the possibly reduced air tightness of the old window be the culprit?
Best Answer
It may be an addition built on a crawl space and not a real basement. Buildings on Crawl spaces tend to be more humid. Single pane windows condensate alot more than double pane which will put moisture into air.
Run a dehumidifier during colder months and A/C during warmer months to pull moisture out of air. If you have a crawl space tell me about it. Type of vents, Flooring, insulation, how much lower than grade is it? Is it damp all time? Just after rains?