The answer to 'humidifier installation cost' is that the cost can vary widely depending on factors like the type of humidifier, the size of your home, and the complexity of the installation. Generally, professional installation of a whole-home humidifier can range from $500 to $1,500 or more. This includes the cost of the unit, ductwork modifications, and labor. Portable or console humidifiers are less expensive, typically $100 to $300 to install.
The size and layout of your home, the accessibility of the installation location, and any necessary electrical or plumbing work can all impact the final cost. It's best to get quotes from local HVAC contractors to get an accurate estimate for your specific needs.