Originally Posted by Las Palmas Norte

Chris ... the design is simple. A 1/2" plywood box with 1 inch styrofoam insulation. I have two tops for it, one constructed the same as the sides (for a nasty cold snap) and the second, a 2x2 frame with a spaced double covering of 6 mil poly. I ran a string (25 lights) of old incandecent xmas bulbs for heat when needed. So far only 3 are used to keep the temp in the 40f - 50f range. (The temperature went to 80f in 15 minutes when all 25 where lit.)
I've cut the banana back once already and felt I couldn't keep doing that so I added another 2' of height to the enclosure.

Cheers, Barrie.