$200 - $1,000. The cost of a humidifier varies depending on the size of your home, the type of humidifier, and the features you choose. You can expect to pay somewhere between $200 and $1,000 for a humidifier that is installed as part of your furnace system.

The cost to install a humidifier on the furnace will depend on the type of humidifier that is being installed, the brand, and the size of the unit. Generally speaking, humidifiers range in price from $50 to $200.