I have a few questions. How important is ventilation in a growroom? If I make sure there’s CO2 in the room via a generator, is that good enough? The reason I ask is because I would like to use LEDs in my growroom, and if I constantly bring in outside air, I fear my rooms will get too cold. (I live in a climate where it gets below 30°F on a regular basis.) And my last question: Do you think the LEDs (Extreme Flower brand) are a good investment, given that they claim their 360-watt light equals the output of a 600-watt high-intensity discharge (HID) light?