I dont see how pumping a gas into the room could cool it. You really need fans to remove warm air and bring in cooler air. With higher amounts of CO2 you can have the temps inside the room higher and the plant do well though.
rnf232s Reviewed by rnf232s on . C02 cooling effect on grow closet Would a steady flow of c02 from a large tank during light hours cool down a small grow room about 15 square ft enough that I could bring a 400 watt hps closer to the plants? Runester Rating: 5