A dehumidifier/dryer is an electrical appliance used to reduce ambient humidity, which is widely used in humid environments such as homes, warehouses, basements, etc. Its core components include a compressor, condenser and evaporator, which condense and discharge moisture from the air through the condensation principle and keep the air dry. There are various types of products, including household small computers, industrial large computers and portable devices, and some of them also have air purification functions. Suitable for the rainy season, coastal areas or places that need to be protected from moisture, it can effectively prevent mold growth, protect furniture and electronic products, and improve the comfort of living and working environments. Parameters such as dehumidification capacity, energy efficiency and noise are taken into account.