Im glad to be on this forum to possibly get some answers so I can move forward with my aquaponics setup. My location (Ohio) unfortunately doesn't have a yard for me to set up anything, nor does it have a basement; but it does have a garage!. The downside to that is it's not heated/cooled and gets very little light. I can put a fan in there for the summer time to keep temps in the low 80's at most, but my main problems comes with winter. The garage doesn't frequently hit freezing levels, but it is poorly insulated which I can fix.

I want to build a small garage greenhouse for a barrelponics setup (Plexi glass, plastic sheeting) but I don't know if this will work. I am wondering...
How warm should I have the greenhouse so that I can grow veggies like tomatoes and beans in the winter?
What type of water heater should I use in a plastic 55 gallon barrel?
What type of HID light should I use, i.e 400, 600, 1000 watt for 2 barrel grow beds?
Can I use dual arc bulbs, do they really work?
Will this bizarre set up actually work?

Any info would be greatly appreciated, even if it means saying this cannot work at all! Thank you for the time
apnewb