I have access to a shed, I am thinking of designing a grow. The dimensions are 5*6 feet. The problem is that it gets very cold here in the winter and im thinking will this limit possibilities. There is a small portable heater that blows hot air already set up, but how would I be able to use ventilation as the temperature is so low. Im thinking of using 1 1000 watt hortilux hps for the entire grow, perlite/soil mix, bat guano for nutrients, walls are already white. I will put a few fans in there and will do lst. Any help designing this would be appreciated.