AC vs dehumidifier for basement humidity when it's not hot out?
Trying to wrap my head around a situation in my basement. it's that time of year where outside temps are mild (low 70s), so my central AC isn't really kicking on. The basement itself stays cool on its own, maybe 65F.
The problem is the humidity is creeping up, hitting 60-65% RH. You can start to feel that dampness in the air (and that musty smell starts to come back). I've got a KeepGlad dehumidifier down there set to 50% and its doing its job, pulling a good bit of water out.
What I'm trying to figure out is the HVAC logic. I know the AC dehumidifies when it runs, but that's just a byproduct of cooling, right? if the thermostat isn't calling for cool air, it does nothing for that basement humidity.
So is this just how it is during these cooler, damp "shoulder seasons"? Is a separate, dedicated dehumidifier the only real fix, or am I missing some setting that would make the main system handle this? Seems odd that the big HVAC unit can't manage humidity unless it's also hot outside.