green house, heating and cooling

Stanly

New Member
Hey, I've been toying with the ideal of a green house (not going to happen in the near future but I like to think about it) anyway I was wondering, how do you heat/cool your green house? And how much can you drop or raise the temp from out side temps. I have read some about piping air under ground and also know the sun will heat it up some during the day.
 
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