Could you put in several skylights in that covered roof portion? that might cut down a bit on your lighting needs-
Also, the front face of it (facing out)- you can line with water barrels as you find them- water holds a lot of heat and may significantly reduce your need for a heater with enough bulk of water (search Passive Solar designs)
Then, as long as its doesnt freeze completely hard out in that area, you could bring in your wormbins for better production year round!
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