Humidity control in hot and humid climates
Where night temperature and vapour pressure, not daytime heat, decide whether the crop sets fruit.
The two failures
Dry heat is a cooling problem: evaporative cooling works and the house can be kept below the crop limit. Humid heat is a dehumidification problem: evaporative cooling adds water to air that is already saturated, and the crop stalls at night.
Design levers
Air exchange rate, roof vent area, internal air movement, mechanical dehumidification, and a control strategy written on VPD rather than temperature alone.
What it costs
Dehumidification is an energy decision: every kilogram of water removed costs electricity. Sites with cheap power and expensive crop loss should invest there first.
What to measure
Log temperature and RH at crop level in several positions for a full season. One sensor at head height tells you what the weather did, not what the crop experienced.
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