The answer to 'average cost for humidifier' is that the cost can vary widely depending on several factors. In general, whole-home humidifiers typically range from $500 to $1,500 installed, while portable or room humidifiers can cost $50 to $300. The type of humidifier, size of your home, brand, and installation complexity all impact the final price.
Factors like the size of your home, the type of humidifier (whole-home vs. portable), and whether professional installation is required will all influence the overall cost. It's best to get quotes from local HVAC contractors to determine the specific cost for your home and needs.