Planning to heat my grow space this winter with a propane wall heater ( https://www.amazon.com/Bluegrass-Li...keywords=garage+heater&qid=1600897525&sr=8-23 something like this ) The area I grow is in an insulated room in a building with no other climat controls. Do you think it would be cheaper than heating with electric, and do you think it will raise co2 levels significantly?