The best levels of home humidity range from 30-50%. During winter, your home is most comfortable when humidity levels are at 30-40%. But during summer, you may allow 40-50% humidity in your home.
You can invest in a digital hygrometer to accurately measure the humidity in your home. Smart thermostats are also a good option for determining your indoor air humidity. Both have sensors that can detect the changing levels of relative humidity inside the home. Some devices are also compatible with HVAC units so that automatic changes in the HVAC can be done once humidity levels drop or rise significantly.