indoor but kinda outdoor so-cal

hey guys on my balcony i have a storage space where my hot water heater is,and i was wondering if it would be ok to grow in this space,besides the water heater there i have plenty of room to grow 2-4 plants,i would be using a 250 watt light<when i get one>i would be doing this in the late fall time in socal...the water heater gives off some heat not much....i do not know how cold it gets here in socal but would it be possible to pull it off...

the door to the space has a square in each door where there are holes so air exchange would be fine,i was thinking of covering the squares with some carbon filtor to block smell,would grow in soil in 3 gallon pots,and will use clones<1st time...if yall need a pic i can get one but not really needed...

i know for security i would be able to move everything if needed...and will hopefully grow some indica dom strains from a disp..when i get my card and stuff..