They are just AC units in reverse. The biggest effect humidity is going to have is on how much condensation is going to form on the exterior radiator. That’ll form frost that’ll have to be melted in a defrosting cycle. That’ll decrease performance and efficacy. Low humidity should keep that to a minimum.

I was kind of thinking something similar. How close would you be willing to physically get to him knowing that at any moment there might be an assassination attempt?