Humidity levels in the tropics can be improved by ensuring a stable building envelope, using dehumidification, and microclimate storage.
When considering the building the following should be checked
ensure the gutters are clean and capable of redirecting water,
In order to develop a humidity management plan, survey the collection and characterize the objects in terms of their sensitivity to relative humidity; first by material characteristics, organic, inorganic and composite, and then characterize the sensitive materials individually. Once the vulnerable parts of the collection have been identified microclimates can be used to buffer the items from daily and seasonal fluctuations. These can take the form of display cases, draws, or frames, which have RH% buffers such as activated charcoal and silica gel.
Dehumidifiers are effective but the use should be planned around seasonal drifts to ensure appropriate set points and allowable fluctuations per 24 hours. The AICCM recommendations for RH are between 45-55 % with allowable fluctuations of + 5% per 24hrs.
In warm humid conditions, such as in tropical areas:
If you are constructing a new building or modifying an existing building in the tropics, remember that non-air-conditioned buildings should have breezeways if possible.\
During wet season keep wet people at the front door. This will prevent the introduction of excess moisture.