The design needs to be adjusted for your climate. If it is really hot, you can install cooling tubes that are about 6-12" around and are buried about 6 feet underground spanning at least 30 feet or so. Combining this with the passive solar design and skylights that open to allow heat out and for cool air to be pulled through the Earth pipes. In India, there are ancient systems of air conditioning that even had flowing water through marble openings. It's all about design! Ventilation is probably helpful for humidity, but to a point. Anyone else have suggestions for humidity? Thanks for your comment @professorbromide ! They have designs now for places like the Phillipines, that's probably the best starting point to see what adaptations they have made.