Tent in a unconditioned space

I live in Toronto and wanna do a run in my garage in a tent. the garage is unheated. Do you think a 1000watt on 24/7 would be enough to keep the tent warm enough?

If I veg for 2 months it wil e june and temps will be warmr when I switch to 12/12.
Does anyoe have experience with doing this? I dt rea wanna runa heater as the light ca give off lots of heat. if my house is 69F and I shu the fan of I have no problem going to the high 90F

To much of a temperature swing in a garage, plus there security to think of ...relocate to indoor for 2 months

ventilating your tent is going to mess with the temps if its really cold out.