Humidifiers and Dehumidifiers - Which unit to install humidifier on..

I live in TX and although the heat doesn't run much, when it does it really dries our house up. I would like to install a Honeywell 260A Bypass humidifier on one of our units. We have a 5 ton A/C for downstairs and a 2 1/2 ton unit for upstairs. If I only want to install it on one unit, which would be best. 3 bedrooms up, master is down. Does humid air sink and it would be better to install it upstairs?

Thanks...dry in TX:o

Id say if the heat does not run much the RH can't get that low! Plus if it does not run much why by a unit for the HVAC system. Get a table top unit for small amount of money!

Like Air said, why spend money on something that not going to run much since heat don't run?

How low are you talking about for humidity wise?

It's -8 now, and the humidity is runing at about 25%.

Like Air said, why spend money on something that not going to run much since heat don't run?

How low are you talking about for humidity wise?

It's -8 now, and the humidity is runing at about 25%.

I guess it's all relative. During the day, the heat kicks on about 3-4 times total. As soon as the sun goes down it maybe kicks on 1 time/hr. Reason I want to install a whole house one is because our house is 4000 ft2. I am tired of filling up the room ones every night in each of the 3 rooms...We usually go to bed with RH in house at 45-50% and when we wake up it is about 35% and we have very dry skin and dry throats...

We would probably need it from beginning of January till mid March.

35% is not to bad! Look into a unit that will hold more water! I just got one at HD for $100 that holds like 4 gal! It will easly do my 2800 ft home and it has not ran for two days and Im still at about 45%. Something else you can do is don't run your bath fans as much. This will add lots of RH to the air!!!!

I agree, 35% is not dry.. Ours is running around 25%, but the temps is right now -14, so I can't go any higher than that or my windows are going to be raining!

20% and under is dry!

Just getting ready to install the humidifier and I was cutting open the return plenum and found somrthing that I was not used to. Our units are upstairs in the attic. Anyway, the plenum has insulation around (about 1 1/4" thick) with a foil layer on the outside. That is it. The plenum is 100% insulation and the foil outer layer. There is no interior sheet metal ductwork. The whole plenum is exposed to the tightly woven fiberglass. Is this OK? Normal?

If it is normal, how do I attach the humidifier to it??

http://img232.imageshack.us/img232/2213/dsc02008mediumou1.th.jpg (http://img232.imageshack.us/my.php?image=dsc02008mediumou1.jpg)


Greg

Sounds like you got ductboard, I don't seem them up here since we use sheetmetal. Some one may be able to help out...

Also, I don't know your winter temps, but putting this in the attic is too much of a risk of freezing!