it's only a 6 x 8 snap & grow.. I did put bubble wrap on the inside and the heat was not distributed well.. was sitting at the top of the peak... and actually opened the vent on the roof and let the heat out without the fan... have to figure out how to put one in there.. I put a wireless thermometer in there and it was maybe two foot from the ground.. it was as cold as outside at that level.. but when I went in and moved it up to a hanging basket it was much much warmer.. so I think the fan is the answer
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