A question from a fellow grower:
I just started to take up indoor growing. Medium scale. I’ve got 4 plants ( 3 AK and 1 Purple Kem OG ) anyways they are in my grow tent in 3 gallon smart pots. I’m using coco Coir with perlite currently for my soilless medium. Growing currently under 1 400 watt MH for veg and HPS for flower. Only question i really had was, if the air outside is pretty cold( like 40 degrees) how would I generate the new c02 exchange if I run the risk of damaging the plants with air that is too cold and low on humidity.