Not sure what type of shop you have, but moisture can be a challenge, especially when warm spring air hits the cold thermal mass of the concrete floor in the shop after a long winter. Same as the moist air hitting the cold bus. We do have a heat pump for the shop which does remove moisture in the summer when the A/C is on, but in winter we only run it enough to keep the shop around 44 degrees when we are not up there, not always enough to remove the moisture. We have a separate de-humidifier purchased from Lowes that has a condensate pump so we’re not emptying the bucket. We run it through the condensate drain for the HVAC. I will say that if you purchase a de-humidifier, I would purchase the more energy-efficient model. We were not quite prepared for the more than expected increase in electric for the standard model. while the older coaches are a little more tolerant of moisture and maybe some light corrosion on a connection, newer coaches are a rolling computer and are much less tolerant of a bad connection and the added resistance. We keep the shop humidity about 45% and also keep the electric toe-kick heaters heating a bit more than the shop temp. The reason for keeping the entire shop de-humidified is because moisture on the outside of the coach we can see is far less concerning to me than the moisture forming in places we can’t see. Way more than you wanted for a response maybe, but this is what we are doing. We used to pump dry air 40% RH through aircraft when they were parked and our avionics discrepancies dropped significantly.
Best Regards,
Stephen