About this item Nakoair Solar air heater  No cost for heating  Ventilation  Dehumidification  Humidification  A healthy indoor climate. Avoid moisture, mold, fungus, formaldehyde (HCHO), TVOC, benzene, ammonia, odor. Solar collector with LCD thermostat automatically processes indoor air. Simple operation, thoughtful air management expert! Automatically switch between solar and electrical energy. Ventilate regularly to purify the air every day. The air outlets run automatically. Applications: Holiday homes; Residential and commercial buildings; Cabins and summer houses; Caravans and tents; Greenhouses and drying rooms; Cellars and storage rooms; Football and other sports rooms; Houses without electricity. Nakoair heater is started according to solar radiation. Approximate room area for OS20: 40㎡; Maximum air flow: 88m³/h. Estimated energy supplement 525kwh/unit/year. Temperature rise: approx.10°C. Get your money back in 2-3 years. When it's a sunny day, OS20 will heat outdoor fresh air all the time. Even…