I have a walk in closet that had a rubbermaid grow (22 gallon bins) and I wrapped emergency blanket inside of the bins. Its reflective and did the job while battling 30 degree temps on the outside of the bin. I would adjust the intake fan aim it at the 12 cfl's I had running. Unfortunatly I upgraded to MH and now I only use the lower half of the bin to keep the roots a bit warmer. I'm still battling the low temps!! :smokin: