I had my tent running the last couple days as I waited for my bags of fertilizer to arrive. I wanted to make sure the VPD was in an optimal spot before I started germination. The black fan in the top left front corner is actually a space heater. It's still a bit chilly in Michigan and should be for at least the next week. I tired standing it on the ground but since it doesn't have an auto shut off it just seems to counteract the humidifer. Strapping it to the top keeps it warm enough and yet doesn't effect the humidity as much.