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Old 11-23-2018, 12:09 PM   #16
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Re: Air sealing aluminum windows for winter.

Originally Posted by Bud9051 View Post
If you have any moisture issues or a dirt floor in a crawlspace or basement that can be a major source of inside humidity. Pick up an inexpensive RH meter to get an idea as to how much you have. There are steps you can take before you buy the dehumidifier.

Hey Bud,

I bought the RH meter and I have 42%

Apparently the lower the outside temp the lower the RH I need to keep inside?

The thing is I am not doing anything in particular and have 42%.

I was thinking about buying a humidifyer to increase the humidity below 50% to try and make the space feel warmer. I have read that higher humidity in winter will help with comfort. The house is kept at 72 degrees inside constantly and I still feel cold. I do not want to increase the condensation on the windows though, so I don't know what your recommendation would be.

Any insight appreciated.

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Old 11-23-2018, 01:07 PM   #17
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Re: Air sealing aluminum windows for winter.

The window temperature needs to be increased and that's done from the exterior. Storm windows and doors came to being a long time ago for this reason.

Take a temperature reading of the window pane and aluminum frame on the inside and compare to dew point temperature. According to Temperature, Relative Humidity and Dew Point calculators, with the room temperature of 72F and a RH of 42% the glass and aluminum surface temperature will need to be above 47 to prevent condensation.
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Old 11-23-2018, 02:14 PM   #18
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Re: Air sealing aluminum windows for winter.

42% RH is not a bad number, but aluminum windows are very difficult to warm up.

I see a screen on the lower portion of that window. Try another window and remove and cover the screen with the plastic film then reinstall. That puts the extra layer on the outside to help warm the inside. Then compare it to the one you currently have the plastic on. If still condensation, do both inside and screen.

Is there a storm window available to replace that screen?

I volunteer my help and opinions, but you are responsible for what YOU choose to do with that information.
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