Hello again growers, I will have access to a spot that is kinda up in the mountains(in CA) and when I was there the other day around 4 pm it was around 40 degrees F. I will have the grow room inside, how much will a 1000 watt MH heat up a room that is about 10 x 10? I'll have it ventilated for fresh air but I'm not sure if I'll need to vent the hot air from the light since its so cold there and the house doesn't have a heater(just a fire place) Also, when it flowers, whats a good way to keep the room heated while its in its dark period? Thanks again! Journal coming soon!