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aemeijers

wrote:
On Wed, 2 Apr 2008 21:20:23 -0600, "Bob M." wrote:

How many times do you really need to
lower the top pane anyhow?

This dates to the years before air conditioning. When you are
ventilating a room with convection, opening the top sash allows the
hot air at the top of the room to get out. That is the same reason why
they had transoms over doors

Bingo. That is why houses down south (especially in swampy areas like
New Orleans and Washington DC) often had damn-near floor-to-ceiling
double-hungs. Population down south didn't really start spiking till
a/c got practical and cheap- it gets NASTY down there in summer.

--
aem sends...