From: Ellen K. 

Actually here in California there are also light-colored roofs.  My roof is
asphalt shingles in sort of a light gray color.   (I didn't pick it
out, came with the house.)   In the 60's white crushed rock roofs were
all the rage.

On Sat, 10 Dec 2005 11:42:19 -0800, Tony Williams 
wrote in message :

>Geo wrote:
>> "Tony Williams"  wrote in message
>> news:4399df01$1{at}w3.nls.net...
>>
>>
>>
>>>We need chamaeleon roofs: dark when the sun's shining, light when it
>>>isn't. Maybe I could buy a few crates of photo-sensitive sunglasses and
>>>use them as shingles.
>>
>>
>> That's great if you live in buffalo and it's January but in a greenhouse
>> world you probably want to reverse that to keep the heat down.
>
>Yes you'd need two versions, one for a cold climate and one for hot. It
>does answer your original question about why we have dark roofs though:
>they were designed in cold climates.

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