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Not getting enough humidity in our house in the winter resulting in cracks in moldings, etc. Level drops to 15-20% without use of portable electric humidifer. 2 Story great room, 3600 sq. ft. house...2 furnaces...2 general aire humidifiers (model 1099LH and 1042)...checked all lines and water flow into humidifiers (everything checks out)...was thinking of adding a second humidifier for the furnace that handles the main floor in-line w/ 1099LH...thoughts? Comments: Nov 18, 2009 - Could it work out if I took the drain line from the first humidifier from above and ran it into the top of the second humidifier in order to simplify installation..also water will be a little warmer to aid in evaporation into the air? Also now that I think about it, isn't it more efficient to add the humidity after the are is warmed? not on the cold air return? Thanks, John

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  • jaustindds Nov 20, 2009

    House is pretty tight...double pane windows, etc...also pads are new...line is clear...flows when furnace runs....i've checked all the obvious...

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Hi,
Getting enough humidity in a house can be difficult in some climates. Some types of furnaces can make the problem worse also.
Before I would look into install more of what you have, I would consider installing a steam type humidifier. These units not only warm the water but actually produce steam directly in the air stream. When a unit says it will make 9 gal a day, with these it actually can do that! And YES!!! I would install this unit in the supply duct instead of the return. I would not want to be pulling this steam through my furnace.
These units are a bit more difficult to install and they require periodic leanings to remove the **** left behind by the water, but they will give you the humidity that you desire.
I have installed a number of steam units and can tell you that they do work well.
Feel free to comment back if you have any questions.
You can see a product like I am recommending here
http://www.amazon.com/dp/B001FD8A94
There are other similar products available, I have used a couple of different ones and I cannot say that one is bettter than any other. The best product is going to be the one that you can get for a good price and get part for if you need them. Check with a local HVAC Supply House to see what brand product they carry and can give you good service on as far as warranty and parts go.
I hope that this information will give you what you need to solve your problem.

Thanks For Using Fixya!!

Heatman101

Posted on Nov 21, 2009

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John,

Two furnaces with a 1099LH and a 1042 humidifier should easily keep your home warm and with the correct humidity level.

Things to look for would be the evaporator pads on your humidifiers. Make sure that they are new. Clogged or old evaporator pads will not transfer water to vapor at the proper rate.

Another factor is how "tight" your home is. You must make sure your home is free of drafts or other factors where air is leaking in and out of you home. This is one of the biggest causes in the loss of heating, cooling and humidity. PLEASE CLICK HERE This will take you to the Energy star website which talks about a tight home.

My conclusion:

I don't believe you need another humidifier added to what you already have. Make sure everything is working properly and make sure your home is tight.

John, I hope this helped you out and good luck!

PS- You are correct, warm water will evaporate faster than cold water!

Posted on Nov 19, 2009

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