I have three lights in there running 24 hrs so everything is in veg. right now it is almost 78 in the green house. I have it on a wood platform with a false bottom to retain some heat. I am going to put mulch around the whole thing to help retain even more heat. but the furnace line going in helps. I have my garage kept at 75 .Yea Browndirt is still slinging seeds, couple different real good outdoor breeds for my area. I just emailed him a few days ago. He is still in Canada.