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Old 11-10-2011, 05:24 PM   #1
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Humidity Reading


Humidity Reading
My hygrometer reads about 60% in my house throughout the winter. I have a humidifier on my furnace, but do not seem to require its use due to my house reading. I was curious as to my high house reading so I placed my hygrometer inside the duct work going into my humidifier. My reading there was about 30%. I also have a humidistat mounted directly above the humidifier that when I adjust it I can hear a click when the dial is about 30 to 35%.
1. Why do the two readings differ?
2. Which reading should I use to determine if I should use my humidifier?
Thanks,
Jerry
11/10/11

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Old 11-10-2011, 05:43 PM   #2
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Humidity Reading


I have compared my customers hygrometers to my Pro unit and have found them to be out 10-20%. Probably yours is too. Those cheap table top units are usually inaccurate. If you want accurate readings try order a UEI one online. Especially important if you have hardwood floors.

http://www.ueitest.com/product-dth10.html

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Old 11-10-2011, 06:09 PM   #3
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Humidity Reading


I understand your comments. However, I checked the accuracy of my readings as follows:
1. Although my hygrometer is store purchased, it did agree with another store purchased unit.
2. I have a wet-dry bulb hygrometer, which should be accurate, and it agrees with the hygrometer I used.
3. And, although the furnace mounted humidistat is not a professional reading device, when I heard it click on and off at about 30 to 35%, that seem to me another confirmation of my duct readings.
And finally, a 50% difference seem to me more of an issue than accuracy.

Also, my hygrometer read about 60% next to my humidifier when it was reading about 30% inside the duct work going to the humidifier.
Thanks,
Jerry

Last edited by Jerry8C; 11-10-2011 at 06:15 PM. Reason: Clarification
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Old 11-10-2011, 06:23 PM   #4
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Humidity Reading


Depends where you live. I can guarantee you that most peoples windows will sweat like crazy at 40% RH when it is below -5 deg C or 23 F for the US. Anybody in the Great White North where I live can attest to that. Seems rather unlikely that you could ever get the humidity that high. Impossible to get it over 40% here unless you have a large steam humidifier. Seems to me like your duct humidistat is accurate and not the one you are using upstairs.
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Old 11-10-2011, 10:12 PM   #5
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Thanks for your reply. I may need to do more checking.

Jerry
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Old 11-11-2011, 05:31 AM   #6
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Humidity Reading


Post pics of your duct work, where the humidistat is.
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Old 11-11-2011, 06:49 AM   #7
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Is there a fresh air pipe bringing in outside air into the return?
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Old 11-11-2011, 07:51 AM   #8
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......
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Old 11-11-2011, 02:32 PM   #9
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In "never stop raining" Vancouver with coat rooms dripping with wet gortex, live musicians with fine wood instruments who run there furnace humidyfyers at max 24/7 and never get over 40%.
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Old 11-11-2011, 03:15 PM   #10
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Yep, at least in Wpg. aka Winterpeg it is a "dry" cold. -60 with a windchill but what the heck the Sun is shining.
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Old 11-11-2011, 04:33 PM   #11
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Yes Yuri
Makes ya wonder why all my relatives from Winni have now moved out here. I'd show them your sunny posting if I thought it might make em reconsider.
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Old 11-11-2011, 04:36 PM   #12
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Kinda wonder what those occupy the **** protesters are thinkin. Sleepin in a tent in the Peg is goin to get mighty miserable soon.

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