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What should I expect from my humidifier?

Resideo wants to make sure you know what to expect from your humidifier. Feel free to discuss these items with your installer:

Achieving Humidity Setpoint. It may take up to a week of continuous operation to achieve the humidity setpoint, especially if the home is dry when the

humidifier is installed. This also depends on such factors as weather, size of the home, furnishings in the home, and insulation.

Ideal Humidity. Homebuilding industry experts cite 35% relative humidity as ideal for comfort and safeguarding the home during the typical dry season. Adjust

your humidity control to your comfort or until there is condensation on the windows. Lower the setpoint if condensation appears.

Unit Not Humidifying. If the humidiﬁer is not running but the humidity is below the setpoint, the humidity control may have a frost protection setting to prevent

window condensation from appearing. See “What is a frost setting?” on the next page.

Home Ventilation. Excessive ventilation sends moist air outside and replaces it with dry air. If the home is drafty or has mechanical ventilators installed, it may

be hard to maintain the humidity setpoint. If installing a ventilator, use a solution that retains moisture. An Energy Recovery Ventilator (ERV) is recommended.

Cleaning Requirements. The humidiﬁer pad should be changed at least once a year. The water trays of the humidiﬁer should be cleaned at that time. See the

Cleaning and Maintenance section for details.

Energy Consumption. You may notice a slight increase in overall energy consumption when operating any humidiﬁer. However, humidiﬁed air feels warmer

than dry air. This allows you to lower the temperature setting on the thermostat. Every degree lower on the thermostat can save up to 3% on heating costs.

EVERYDAY OPERATION

How do I operate the humidifier?

Once the humidifier is installed and running, the operation is automatic. Use the humidity control provided to make any changes to the setpoint.

If you have questions about how to operate the humidifier, ask your installer.

How do I use the humidity control?

When the humidity in the home is lower than the humidity control’s setpoint, the control will call for humidity. Some controls will also monitor outdoor conditions to

ensure indoor humidity does not condense on windows and walls.

What should my humidity setpoint be?

The outdoor air temperature aﬀects how much humidity can be retained by the air in your home. Use this table as a starting point. Then adjust the humidity control

to your own comfort or until condensation appears on the windows, at which point you should lower the setpoint.

What is a frost setting?

Some humidity controls (such as Prestige, VisionPRO IAQ, and TrueIAQ) contain a Window Frost Protection feature that limits humidity output based on outdoor

conditions. For example, on colder days, the air in your home can hold less humidity. The humidity control automatically lowers the humidity setpoint accordingly, to

prevent frost from appearing on the inside of your windows.

Lower the frost setting by one value each morning that you see frost or condensation on windows. Allow 24 hours for the new setting to take eﬀect before re-

adjusting. Once you have this set to a comfortable level without condensation, you will not need to adjust further. You can adjust your humidity setpoint without

worrying about condensation.

Outdoor

Temperature

-20°F (-29°C)

-10°F (-2-3°C)

0°F (-18°C)

10°F (-12°C)

20°F (-7°C)

>20°F (-1°C)

Recommended Relative

Humidity Setting

15%

20%

25%

30%

35%

Manual humidity controls (such as the H8908) do not have built-in frost settings. They require you to adjust the humidity setpoint when the outdoor temperature

changes. Use higher humidity setpoints when the temperature is warmer, and lower setpoints when the temperature is cooler.

Humidifier lights and button (HE150/HE250/HE300 only)

The three lights provide feedback on humidifier operation.