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Posted by aemeijers on April 3, 2008, 12:03 am
gfretwell@aol.com 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...
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