Winter air conditioning is designed to ensure comfortable indoor conditions during cold weather. In winter, outdoor air is typically cold and dry. When this air enters a building, it requires heating to reach a comfortable temperature. However, heating can further reduce air moisture, leading to discomfort such as dry skin and irritation. To counter this, humidification is incorporated with heating to maintain adequate humidity levels. This dual approach ensures both a warm temperature and a pleasant moisture content. Cooling and dehumidification are processes associated with summer. Sensible cooling, which lowers temperature, is unnecessary in winter. Consequently, the combination of heating and humidification is the appropriate function for winter air conditioning.