| I have a temporary (horticultural plastic sheeting & bubble wrap insulation) greenhouse at 6000' in Prescott, AZ. Trust me, your humidity isn't as low as it is in Arizona. I use a fogger which gets the humidity in an 8 x 12 GH up to 50-60%, which is plenty. You will need an evaporative cooler, dependable heat, and lots of fans. I heat with electricity, and have portable tanks of propane and a Southern Burner heater as back up.
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Cynthia
Prescott Orchid Society  |