Hi Lisa
Our quinquennial reports suggested putting in humidistat fans to continually draw out moist air when needed. Apparantly they are very low power use.
However we have the dilemma that many residents tend to switch off fans at the isolation point to save electricity! We also have installed much higher powered inline type fans particularly in bathrooms which residents will use briefly after a shower and will clear most of the moisture build up.
In units where moisture/condensation has been very problematic we have installed PIV units with the isolator switch in a hard to reach place (eg inside the loft hatch). This has solved any mould issues (provided the original problem is properly cleaned up).
Sarah