We have a 6500 square foot green house. We fired up our Garn 11/20/10. And ever since we have had a lot of sleepless nights. Grant it we have 20 below weather at night sometimes. This is our only source of heat and I was was wondering if there are any tricks to get longer burns. One thing we recently just incorporated is making one bay cold crop at 50 degrees. And this bay is sealed up from the other 2 bays. Next year we plan on making 2 bays cold crop. Leaving only 1 bay for hot crop at 67 degrees. Until then me and my team are worn out. The green house does have a low R value but we have a shade curtain and it is sealed up as much as possible. Is there a way to use lava rocks or something you can do a last burn at midnight and then the rocks would maintain the heat for a few more hours? Please let me know soon. I can't afford to hire anyone else to do a night shift. We do love the garn and that it is eco friendly. We just need more sleep.