In San Antonio, I'm able to get about ~8-10 deg of change on my windowsill. I have everyone on a south facing window with a small room humidifier, an oscillating fan, and the window about 4 inched open. My humidity ranges from 60-80%, with higher humidity in the morning. Everyone appears to be happy and I've had new growth on quite a few of my orchids in the past month or so. I'm growing Neofinetia falcata, Schomburgkia crispa, Dendrobium anosmum, Brassavola nodosa, Ascocentrum ampullaceaum, and several others to include Lowe's bought juvenile orchids.
Not sure how different the climate is between San Antonio and Houston.
Hope this helps.
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