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1. Adjust indoor temperature and humidity The hot and cold circulating air blower can provide cold or hot air as needed, and adjust indoor temperature and humidity by heating or cooling the air. It can use cold air mode for cooling in summer or hot air mode for heating in winter. 2. Increase air flow and circulation Long term lack of ventilation indoors, poor air circulation, and easy breeding of bacteria can affect health. Cold and hot circulating air dryers can accelerate air flow and circulation, effectively moisten and prevent air dryness, and reduce the growth of bacteria and viruses. 3. Suitable for various occasions The hot and cold circulating hair dryer is not limited by the venue, has a small size, and can be carried at any time. It can be used in various occasions, such as offices, homes, cars, outdoor camping, etc., and is more flexible to meet the needs of different situations.