[Greenbuilding] [BULK] Re: Windows - double hung

[Lawrence Lile]

Thanks, Laren - while John may be stuck with a certain style for
historical purposes, the rest of us can really benefit from this info.  

I am so glad I went with hinged windows in my house instead of double
hung - the hinged windows can be cleaned from inside, and I believe they
also seal better, and now you've pointed out advantages in solar gain.

If there is wind pressure from outside, the hinged window will compress
it's seal tighter, whereas one of the leaves of the double hung window
will be pushed away from the other, exacerbating leaks.  I have watched
this happening on windy days, I used to have some windows that would
sound like a comb-and-toilet-paper kazoo on really windy days because of
this phenomenon.  Either fixed glass or hinged windows are the best
high-tech option if you have a choice.  

Lawrence Lile, PE, LEED AP
Project Solutions Engineering

-----Original Message-----
From: greenbuilding-bounces at listserv.repp.org
[mailto:greenbuilding-bounces at listserv.repp.org] On Behalf Of LarenCorie
Sent: Thursday, August 02, 2007 12:21 PM
To: greenbuilding at listserv.repp.org
Subject: [BULK] Re: [Greenbuilding] Windows - double hung
Importance: Low

From: "John E. Beeson" <jbeeson at quinnevans.com>

> does anyone recommend a manufacturer that makes a good
> double-hung?
>
> And yes, I read this already, but I'm trying to match the historic
> windows:
> http://www.thermotechfiberglass.com/Column3.htm

Hello John;

  There is another factor, that virtually all of the window
manufacturers, and the article above, miss, which makes
all sliding and hung windows even less energy inefficient,
compared to hinged windows.   It has to do with Solar
gain, and has been left out of every claim of Solar trans-
mittance, I have seen from a manufacturer.