How much does it cost to run a whole house humidifier?

Bypass and fan-powered models cost $10-20 per month in water and filter replacements during heating season. Steam models can add $20-50 per month in electricity. All types are far more efficient than running multiple portable units.

Will a whole house humidifier cause mold or condensation?

Not if properly sized and controlled. A humidistat keeps humidity at your set level (typically 35-45% in winter). Problems arise when humidity is set too high for the outdoor temperature. Follow the manufacturer's recommended settings for your climate.

Best Whole House Humidifiers 2026