The answer to this question is that it depends. The purpose of a humidifier is to keep the relative humidity (RH) inside a home above a certain level (usually around 30%). If the RH falls below this level for an extend period of time, significant damage to a hardwood floor can result. Seasonal fluctuations in RH vary considerably from place to place, so the answer to the question of whether a humidification system is required or not is best answered by a qualified hardwood specialist that is familiar with the local environment.