The rule of thumb is that if your humidifier is causing condensation on your windows, then you have condensation inside your walls as well, which is the necessary precursor for mold.

We have this whole house humidifier installed in our furnace: https://www.aprilaire.com/whole-house-products/humidifier/mo... It has a remote temperature sensor you install outside, then it automatically adjusts the humidity based on the outside temperature to keep it under the mold-growing level.