Rusty T. what lighting setup do you use for your space. Intake of cold air has been on my mind - I will put in a co2 system and maybe use it only on days of extreme cold or heat. if i do use co2 won't the plants convert it to oxygen? if not I have not been able to drive a car due to my health in 8 months. my contribuation to being green. i'll offset with my grow room I suppose