The cost of professional dehumidifier installation will depend on several factors, including the type and size of dehumidifier you need, the complexity of the job, and any additional features or services you may require. Generally speaking, smaller units (under 25 pints per day) are less expensive to install than larger units (over 75 pints per day). Installation costs can range from $200 to $1,000. The cost may also be impacted by further services such as drain line installation and additional wiring or ductwork. It is best to get estimates from a few local professionals in order to compare prices, features, and services provided.