It is generally recommended to use a plastic exhaust hose with a portable air conditioner, rather than a metal exhaust hose. Portable air conditioners are designed to expel hot air generated during the cooling process through the exhaust hose. Plastic hoses are preferred because they are flexible, lightweight, and designed to handle the high temperatures of the exhaust air.
Using a metal exhaust hose can potentially pose a few issues. First, metal hoses tend to conduct heat more efficiently, which means that the exterior of the hose can become very hot and increase the risk of burns or damage to surrounding objects. Second, metal hoses are less flexible than plastic hoses, which can make installation and positioning more challenging. Additionally, metal hoses may not fit securely onto the air conditioner or the window adapter, potentially leading to air leaks and reduced cooling efficiency.
To ensure proper operation and safety, it is best to follow the manufacturer's recommendations and use the specific type of exhaust hose intended for your portable air conditioner. If you need to replace a damaged or missing hose, it is advisable to purchase a compatible plastic exhaust hose designed for your model of portable air conditioner.