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Yeah I have a large construction site propane heater and with my HPS and last night it was 45 outside and 95 in my LAG and as stated before I get the added benefit of Th e cO2. So I wouldn’t have to get too much heat from them but I probably need more than they put out I am thinkin but I will do a deep dive into LED’s in relation to BTu’sYou'll probably need a heater, my most inefficient builds only heat a 4x4 space to 86f in a 72f room