I’m having a problem with moisture on my windows in cold weather. I try to keep a dehumidifier going, but I still have moisture at the bottom and now it’s causing mold to grow.
You certainly have the right idea with the dehumidifier. There’s no explanation other than what we know from science. Cold air is meeting moist warm air, plain and simple. Keeping your indoor humidity level between 35%-45% is ideal, but if you still have a problem, it’s indicative of an air leak at your windows. Even a very minor leak will be an issue. The first thing is to locate the gap. Try using a stick of lighted incense and, during a windy day, see if you can locate the opening. You’ll know, believe me, when you get next to it. The smoke coming off the stick will be blown aside. If that doesn’t work, you may need to consider having a professional inspect the area with an infrared camera. Either way, once the leak is identified, the proper use of weather stripping and/or caulking should help seal the gap and eliminate the air leak.
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