You won't need the heater. The temps in south Florida in winter range from intermediate to cool to cold. I keep my ghost orchids outside in central Florida except when the temps get below 45 F. Your cooler grow room temps in winter would be beneficial, along with reduced winter watering to simulate the dry season of South Florida.
Also, I must contradict those who say air circulation is a problem. Sometimes the air in the swamps is mostly still. Other times, such as when storms are moving in, there is a lot of air movement. Our home is on a hill with a good amount of constant wind. This has not been a problem for my ghosts.
One major key to success is correct mounting. Imagine laying your mount flat on a table. The plants should be mounted with their new roots "down" toward the mount and older roots "up" into the air. This way, as new roots emerge from the growing center of the plant, they will find the mount surface quickly and attach. Attached roots are much easier to keep happy and growing compared to aerial roots.
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