Heating the air in the house or cooling the air in the house will both reduce the relative humidity (RH). The problems with high RH occur when we have extended periods (a couple of days) of moderate temperatures and rainy weather. Under those conditions, neither the furnace nor the AC will run much at all, and this allows the RH to increase inside the house.
If your thermostat has a humidity control, that's great and that should take care of any RH problem. If your thermostat does not have a humidity control setting, then it's a good idea to have a dehumidifier or two in the house.
Dehumidifiers are relatively inexpensive and they have a control where you can select the maximum humidity. They won't kick on until/unless needed. Most houses should probably have two of them due to lack of air circulation when the furnace or AC is not running.
Be sure to get a dehumidifier that saves your settings if the power goes out. Otherwise, when the power comes back on, the dehumidifier will revert to the default factory setting which may not be suitable for what you want. In fact, it may not even come back on at all. That's not good if you're 1,000 miles away.
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