Hi, what do you guys think of my setup, any advice? I am planning to build in one big room, two rooms with drywall side by side sharing a wall of 15 feet. One room will be for flowering and be 15x7.5x8 feet which is 900 cfm.The second room will be one third smaller than the other room and be around 600 cfm. It will be used for two motherplants, clone rooting and drying harvest. I will insulate the flowering room with styrofoam and seal it. (The two rooms are side by side and will share one wall of 15 feet. I will not insulate this wall, as I hope to share some warmth of the flowering room with the motherroom) Room for flowering: I plan to operate three 4x4 ebb and flow tables with a 100 gallon reservoir and a solenoid valve so that only one table at a time gets flooded. (Water is unfortunately not unlimited available). As a medium I will use rockwool. I will operate three 750 Double ended Gavitas. One Gavita per table. Outside, now in winter, it will have minus degrees and high humidity. So I plan to seal the room and use the heat of the lamp fixtures and also heat a bit by using a CO2 generator with propane (with the heat generated, I can save on electric heating a bit). In summer, I plan to add a minisplit AC for cooling. Also instead of CO2 by propane (which create heat), I might switch to CO2 tanks directly. Because of the sealing, the floodtables, the many plants and the burning of the propane, there will be a lot of humidity. So I will put in a dehumidifier. I am not sure actually, how much humidity I will have to deal with. I thought maybe a 120 pint /24 hours dehumidifer would be alright. I did read overkill is the way to go. You will get your room much faster under control. And of course I will use a fan with charcoal filter. Room for mothers, clones and drying: Here I would grow two mothers in soil or DWC under T5 lights. I would take around 100 - 150 clones every two months. Also I would dry the harvest in that room. I would put a charcoal filter and a dehumidifier in that room and hope that this room gets good warmth of the flower room. I try not to heat with electric heaters as it seems expensive. What do you guys think of the setup? Any advice? And actually I have some questions: - What would be roughly a recommended size of dehumidifier for that size of the room, if you dont have an AC (will add AC later in summer)? - Some dehumidifieres have an ionisator which claims to clean the air. Could this ionisation thing be something I dont want in the growroom? - Should I vent the flowerroom at least once a day? If yes, why? ( I could build in sealed electronic dampers, so the room would still be sealed) - Do I need to inject CO2 in to the motheroom or vent it? In summer I can vent the motherroom, but in winter it is very cold outside and the humidity is high. If I dont vent the motherroom and if I dont inject CO2, I am not sure if the mothers will react badly, because the CO2 levels might go too low.... Actually I don't want to buy another CO2 generator, as they seem too expensive for basically just some sort of gas oven. - Do you think I will need to heat a lot? The building is very very good insulated, but nobody lives there so it isn't heated. Outside it will be minus degrees but because of the insulation the temperature will even without heating never drop to zero. I will insulate the drywall rooms also with styrofoam, so that the heat of the lamp fixtures, the dehumidifier and the CO2 generator will stay in the small rooms.