Comments on: Cold Air Is Dry Air

By: Steve Waclo

Steve Waclo — Fri, 27 Dec 2013 00:00:25 +0000

James Q,

James Q,

Condensation "somewhere" is a concern I have as well. My 2002 home is reasonably tight (2000 CFM/50) but here in the high and dry desert of western NV, I've been adding about 2 gallons a day to my stand alone humidifier to maintain 30% RH @ 70F (20% w/o).

I sometimes lay awake at night, wondering where all that water is going...

Best wishes

By: James Quarello

James Quarello — Thu, 26 Dec 2013 19:08:45 +0000
Conversely, the warm,
Conversely, the warm, conditioned air inside the house, that has an RH of 20% and then diffuses or escapes through bypasses into an attic with a temperature of 32 will condense and freeze on the sheathing. A great reason not to add humidity to the air inside the house in the winter.

By: Skye Dunning

Skye Dunning — Tue, 10 Dec 2013 20:58:24 +0000

The best tool I’ve found is
The best tool I’ve found is here:

http://www.dpcalc.org/

By: Dixie Wong

Dixie Wong — Tue, 10 Dec 2013 13:47:27 +0000
If you sell those shirts, I
If you sell those shirts, I would like the graph on the back of the shirt. Timely topic! Thanks.

By: Karl O.

Karl O. — Tue, 10 Dec 2013 02:32:59 +0000
Allison, great article. Could
Allison, great article. Could you please comment on claims by some HVAC installers that some heating technologies are more comfortable than others because "they don't dry out the air as much." Thanks.

By: Steve Waclo

Steve Waclo — Mon, 09 Dec 2013 22:59:12 +0000
Allison,

Allison,

Back to "Reading Graphs 101" for me :-(. In my feeble defense, it's been so long since I used a psych chart, I was looking at the right side, vertical numbers.

I shall think long and hard before again criticizing the great one :-).

Excellent article on a topic too few civilians appreciate!

By: M. Johnson

M. Johnson — Mon, 09 Dec 2013 21:23:38 +0000
Three cheers for focusing on
Three cheers for focusing on this subject. So many discussions would be clearer if people could just get basic education about temperature and humidity -- I was on the other side for a long while and recognize how much my thinking has changed.

By: Allison Bailes

Allison Bailes — Mon, 09 Dec 2013 16:46:56 +0000
Steve W.:
Steve W.: The graph is a bit hard to read, but the I drew is at 32° F. The lowest temperature given on the horizontal axis is 35° F, and I started a bit before that.

geoff h.: Absolutely. I usually break things down and focus on one little bit at a time. I also like to be seasonally appropriate, and most of my readers are in the Northern Hemisphere. Once we get back into cooling season, I'll hit the topic you suggest.

By: geoff hartman

geoff hartman — Mon, 09 Dec 2013 15:22:21 +0000
Steve - the lune iS at 32
Steve - the lune iS at 32 degrees F.

ALlison - You might append or follow up this thouggt with a comfort application. Fact is that for most of the country, on most days, we have less of an "air conditioning" (read cool the temperature) problem and more a humidity (reduce the moisture in the air) problem. This is especially true for superinsulated homes, and huge problems for superinsulated homes with small gapes in air barrier that allows moisture inside to equalize with outside.

Maybe there are a couple articles here.

By: Steve Waclo

Steve Waclo — Mon, 09 Dec 2013 13:29:13 +0000
Allison,

Allison,

One of the benefits of being in PST is I get to see your articles while everyone else nips asleep.

Check the graph. I believe you drew the line at 22*, not 32*.

Best wishes