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Old 01-13-2011, 04:41 PM   #16
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Humidifier old house


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Not much choice. That is where the furnace is located. I'm in Texas so freezing is pretty rare. I'm installing a condenaste pan under the unit and it will have a float to turn off system in case of overflow. I may add an alarm.


I've tried running humidifiers in the house but they can't keep it comfortable. We only run the heat for 2-3 months and 25 is a very low temp. I'm going to use hot water so that should also eliminate the any freezing issues. I'm just tired of feeling cold at 72F.

I installed a 95% furnace last year which has a condensate drain to outside. I'm a bit concerned about it freezing also. I'm moving that to an interior drain with the humidifier.
You got a 90% furnace in the attic too??

Your lucky...here in Mi we would/could not (at least I would not) install a Horizontal 90% with out some type of system to prevent freezing of the condensate.

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Old 01-13-2011, 04:52 PM   #17
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A humidifier in the attic, is a broken frozen pipe waiting to happen.
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Old 01-13-2011, 04:59 PM   #18
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A humidifier in the attic, is a broken frozen pipe waiting to happen.
Hey Man!

You forgot to mention the furnace. How do you prep a horz attic 90% against freezing in Pa?
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Old 01-13-2011, 05:00 PM   #19
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I'm in the process of installing my Aprilaire 700 now. I was able to get access to hot water. I'm still working on the drain. My unit is in the attic so I'm worried about a leak. I hope it works as well as you say.

I discovered the Honeywell after I had purchased the Aprilaire. I liked the Honeywell design because you can mount the unit anywhere then have the steam line inject steam into the plenum. Instead of mounting the unit direclty to duct work. My plenum is duct board so I'll have to support the unit somehow. I also have leaks through the unit that I can't seem to 100% eliminate. May be more expensive to run because of the heater.
How did that Aprilaire install go, I was thinking about buying one, just wondering how difficult it was.
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Old 01-13-2011, 05:03 PM   #20
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Hey Man!

You forgot to mention the furnace. How do you prep a horz attic 90% against freezing in Pa?
Heat tape and insulation.
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Old 01-13-2011, 05:06 PM   #21
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You could always heat the attic, that way the unit would never shut down.
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Old 01-16-2011, 02:49 PM   #22
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Hey Man!

You forgot to mention the furnace. How do you prep a horz attic 90% against freezing in Pa?
I don't have to worry about freezing in tx. I've been using the existing ac drain for the furnace but I realize that could be a problem because the drain goes outside. It got down to 25 at night last week. So, I'm moving my drain to the bathroom. If I were concerned about freezing I would add heater tape the trap. I also have floats in the condensate pan that will catch any furnace overflow.

Heating the attic would defeat the purpose of a 90% furnace.
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Old 01-16-2011, 02:54 PM   #23
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How did that Aprilaire install go, I was thinking about buying one, just wondering how difficult it was.

Still working on it. I got the drain plumbed to the bathroom yesterday. I also bought pex piping because I was concerned about running 1/4" plastic through the wall into the attic. I also don't know how well the regular 1/4" handles hot water.

I ordered a 2nd condensate pan to put under just the humidifer and that won't come in until next week. I'm going to finish up the plumbing today and maybe mount the unit. Because I have ductboard plenums I'm going to have to support the unit from either above or below. I'll take some pictures when I'm done.
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Old 01-16-2011, 09:22 PM   #24
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Heating the attic was a joke, and isn't 25*F below freezing, hows that work with all that condensate that comes off a 90% furnace, and water for the humidifier.

I think that doing what you are doing (90% and humidifier) is like playing Russian roulette, one day it will cost you big.
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Old 01-16-2011, 10:24 PM   #25
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I don't have to worry about freezing in tx. I've been using the existing ac drain for the furnace but I realize that could be a problem because the drain goes outside. It got down to 25 at night last week. So, I'm moving my drain to the bathroom. If I were concerned about freezing I would add heater tape the trap. I also have floats in the condensate pan that will catch any furnace overflow.

Heating the attic would defeat the purpose of a 90% furnace.
i was addressing another poster...not you.

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