Small greenhouse = 500m2.
Temps range -4 to 10 degrees celsius outside.
Will one s19 be enough to heat this area?
Will the heat loss be too significant?
Is there a way to automate so the temp is ideal?
Thanks!
1- heat it by how much? 1 degree? 2? it probably will, but make it 30c warm? sure not!
2- heat loss will depend on the insulation fo the green house
3- yes you can use something like Awsomeminer to automate it.
Here is a related subject that you might want to read >
https://bitcointalk.org/index.php?topic=5486957.0 , I believe everything you need to know has already been discussed in that thread, just read all the comments and you will learn a lot of things.