Hey guys, I had a question that I thought I throw out to the forum. I have access to a mini excivator and want to build an underground growroom in my back yard. Nothing to large, probably just 4 1000 watts and the cloning chambers to keep them going. My question is how much dirt will i need to fill on top of the room for infered camaras will not be able to see the heat spot on my grass in the middle of winter. I understand insulation will help a great deal but what would you recommend?