Usually the target "relative humidity" level is considered to be 45-55%. As "relative humidity" increases, the amount of "latent heat" in the air increases causing us (humanoids) to feel warmer. Heat tape added to water lines would prevent any freezing of the pipes. However, not enough information is provided to truly analyze your diliema. What type of heating is provided (gas, strip electric, heat pump, etc.) and how much air exchange is provided between the upper and lower systems.
Also...are we talking about adding "latent heat" putting moisture in the air.....or about (de-humifying) removing moisture from the air????
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