Our greenhouse is built of Raycore SIPS panels and Lexan Thermoclear Plus Softlite polycarbonate sheets over yellow cedar laminated beams. Finally, we gave it humidification and great insulation, used reflective surfaces to enhance the natural lighting, and added passive and solar powered venting. Then we put in an earth battery so that we could access additional thermal mass underneath the greenhouse for greater daily solar and seasonal heat balancing. The first thing we did was orient the greenhouse to maximize direct solar gain in the winter and mini mize it (to the extent possible while still getting enough light to grow the plants) in the summer and instill it with massive amounts of stone for passive heat balancing using thermal mass. Here in Boulder we have copious amounts of solar radiation. The main issue is to use what nature has given us and use it wisely. It’s a bit of a trick to build an efficient tropical greenhouse in Boulder however it is completely possible.
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