Maintaining a comfortable humidity range New Zealand has a year round, outdoor RH of between 70–80% in coastal areas and about 10% lower inland. Indoor relative humidities are generally lower than outdoor relative humidities ranging, in New Zealand dwellings, from 30% to 65% during the day-time in a “dry” house, and 50% to 75% in a “damp” house. Cold bedrooms can have relative humidities of 80% - 90% at night-time. Generally, most people will be comfortable in a humidity range of 30–80% if the air temperature is in a range of 18–24ºC. By insulating adequate ventilation to help retain heat in winter and providing to remove indoor moisture generated by occupants, heating requirements (and costs) may be reduced without compromising occupant comfort.