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Message: <blockquote data-quote="nobodyeu" data-source="post: 1918941" data-attributes="member: 200402">Hello,i have opinion to use old cellar to grow room. Its a perfect place to grow. Here is water, 240V (here its 25A, but i can remake distribution) and tunel to out space (it can be used for ventilation).dimesnsion of this room its +- 6*5m or 5*5m (i will be know exact dimmensions soon).This room dont have any heating, so i want use fun controler with hysteresis to temp, humidity and power of funs.i think it will be based on drip system (probably atami wilma 8, 9 or 16).i read, that 1kw HPS can effective use on 1,8-2*1,8-2m. I dont want use all room to growing, i thinking to get here 2-3x of 1000w HPS.How much CFM fun i need here? i want to sending hot air out of room to outespace and also aspirete fresh air to grow room.What about heating? need have here some heating, or 2-3kws of hps can heat this room to 23-25C? Here its maybe 12-15C, but door to outspace is closed and here is not airflow.</blockquote>