Rezi,
You would be amazed at how much difference the sun makes in heating a GH. I had done months worth of research when I was looking into mine, but I still am surprised at how quickly my GH will warm up on a sunny day. I am planning on trying to run a Intermediate to warm GH. Partially because it covers a wider range for my favorite species, and also because it is closer to our natural weather.
Where you are going to run into heating issues is going to be your lack of sun. Even in the dead of winter here we have bright sunny clear days, but again we have subtropical weather here. I recommend trying to find an affordable heating alternative. One of the University GH here uses a corn fed heater to keep some of its aquaponics going through the winter, but I don't know how efficient or affordable something like that is.
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Hybrid Mode
