When it comes to our home we need to ensure it is safe and healthy environment.  And humidity level plays a big role.
In winter time we face humidity level goes down to 10-20% due to the heat used to keep places warm. As a result, lover humidity levels could lead to a line of problems. For instance, health problems, wooden furniture damages, and other.
It is important to know that hay humidity levels could lead to problems too. Including health issues and mold growth.
The ideal healthy humidity for the home should be 40-50%. On the other hand, to avoid condensation on the windows in a winter month it could be lover 40% HR.

So, in  a house with an HVAC system,  the humidity level easily controlled using whole-house or furnace humidifier or dehumidifier which connect to a home’s HVAC system.