I use to hate the winter time, now I love it. Here's what you do. Turn off ya ac and crack ya window a little. Depanding on where you live. I can run 3 1000 watt lights during the day by just cracking a window, temps stay around 73- 75 degrees. In the winter it can hit -10 with no problem. At night I leave it cracked about 2-3 inches and the temp stays around 60-65 degrees.

Be safe and make sure the location of the window isn't where someone can can in. It should look like everyone else windows. Hope that helps.

Oh yeah, the cold air shouldn't blow dierctly onto ya plants.