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In message <[email protected]>, Alex Pummer writes:

>by us  in central California, we get 1kW/h square meter average around 
>the year, the south even more, el Cajon will have today +29C° in the 
>afternoon  as of 23 of November 2014

Yes, the latitude means a lot for ground heating, both in terms of Sun
radiation angle and length of winter.

-- 
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