The official version of where Rammstein got their name is that they named it after the town, Ramstein, where the worst air disaster in history occurred in 1988 at an air show at the American airbase. There was a collision of Italian aircraft that resulted in the deaths of 47 spectators and the injury of about 500 others.
If your home is 70 degrees inside and the temperature outside is under 20-40 degrees, you should keep the humidity under 40 percent. For each 10-degree reduction in the outside temperature below 20 degrees, the maximum humidity level inside should decrease by 5 percent.
Just get a hygrometer to your home, and you can read the humidity levels precisely. A hygrometer is a little device that is user-friendly and inexpensive. Ideally, the humidity level between 40% and 50% is good for living. But if the temperature outside changes constantly, perhaps, you need a humidifier or a dehumidifier to maintain the right levels. The humidity level is decided by many factors, like the area and climate you are living, the season it is on, and forth.