Estimate the amount of moisture a humidifier may need to add each day using home size, ceiling height, current relative humidity, target humidity, temperature and estimated air leakage.
Calculate Humidifier CapacityThis calculator focuses on dry indoor conditions. For the opposite problem, use the dehumidifier size calculator . Persistent whole-home dryness can also be researched through our whole-home humidifier guide .
Enter the home's size and humidity conditions to estimate daily moisture addition.
This calculation estimates moisture needed to raise the humidity of air exchanged through the home from the current RH to the selected target RH. Real humidifier sizing also depends on outdoor weather, envelope moisture buffering, internal moisture, HVAC runtime and equipment delivery efficiency.
The calculator estimates the home's air volume, converts it to cubic meters, estimates saturated water-vapor density at the selected indoor temperature, then calculates the moisture difference between current and target relative humidity. That difference is applied to the estimated volume of air replaced each hour.
Request HVAC help below if you want to provide your Texas location, home information and current humidity conditions.