Topper's Blog: Time to add Moisture to Home, Humidifier

5:08 PM, Nov 20, 2013   |    comments
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Turn off the Dehumidifier

I suspect that everyone has turned on the heat by now. We will really need the heat this weekend as the coldest air of the season rolls into the Metro Are. If you have a humidifier attached to your furnace you need to turn it on and if you have a dehumidifier in your basement you need to turn it off, clean the filter and store it for the winter. In winter you actually want to add moisture to your house. Let's talk about dew points to explain why the humidity is so low in the wintertime.

The dew point is the temperature the air must be cooled to in order to reach one hundred percent relative humidity; when the air is "saturated."  In the morning if you see dew or frost the overnight temperature fell to the dew point or frost point condensing out moisture.  

In spring and summer when the outside temperature is seventy and the dew point is also seventy then the relative humidity is one hundred percent.  In the summer we try and keep our indoor temperature around seventy degrees so the relative humidity indoors is also one hundred percent; that's why we need the dehumidifier. When it gets really cold the indoor humidity can be so low it hurts your sinuses and throat when you sleep. Let's say it's only twenty degrees outside with a dew point of five degrees. The outdoor relative humidity is reasonable fifty one percent but inside you take that seventy degree temperature in our home with that five degree dew point and now the (inside) relative humidity is only seven percent ! Pans of water by your bed side table can help add moisture back into the air and help you sleep.

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