Frost on the inside of windows
Every winter we get thick frost on the inside of our bedroom windows, sometimes ice on the frame. Is that a ventilation problem or are the windows done? The house is about 30 years old in Winnipeg.
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Probably a mix of both. Indoor frost means warm humid air is hitting a cold surface. First check humidity, in a Winnipeg winter you want it around 30 to 35 percent indoors. Run bathroom fans and keep blinds open at night so warm air reaches the glass. If you still get ice on the frames, the seals or frames are likely failing. We had the same thing and replaced ours with Energy Efficient Replacement Windows in Winnipeg, triple pane with warm edge spacers, and the frost stopped. A hygrometer costs a few dollars and will tell you a lot before you spend money on windows.