Although catts and oncids will tolerate the low 40's, prolonger low temperatures
below 55 will send catasetums into dormancy. So it depends on what orchids one
is growing. I have a 57 degree F min temperature for my greenhouse, and
although one year I lost power and temperatures got down to 34 degrees while I
was out of the country -- and not much was lost -- I would not recommend this.

.. . . Pam
Everything Orchid Management System http://www.pe.net/~profpam/page3.html

Kenni Judd wrote:

One more question, which may just result from my own inexperience with
anything other than warm growers -- but if this is for an intermediate group
of plants, why is your night min. temp so high? We heat to 55F because we
have only one house, so everyone has to be as warm as the most heat-loving
of our vandas and dens, not too mention the seedling-babies, but I know that
our mature Catts and Oncids would not only tolerate, but welcome,
considerably lower temps.

If and when we raise the $$ to build it, our next house will be for those
latter, and will be heated to no more than 40F, maybe lower.
--
Kenni Judd
Juno Beach Orchids
http://www.jborchids.com

"kenty ;-)" wrote in message
news:1096803384.9kaoQ80nf6crr+oLz+bazg@teranews...
Hi Everyone,With autumn/winter upon us,my first growing in the greenhouse
I
have a question about how you control temp with the day or just a set
amount
of temp(8 hours a day, for example) regardless of daylong.
--
Thanks Keith,England,UK.