Can I connect a Model 400 Humidifier to a Heat Pump system?
Model 400 humidifiers can be installed on heat pump systems. However, due to the fact that heat pumps deliver lower temperature air to the home than gas furnaces, evaporation will be approximately 60% of rated capacity (Note: With other Aprilaire models, hot water can be used instead of cold water to maximize evaporation. However, due to the nature of the wicking water panel in the Model 400, hot water provides no extra benefit). As such, your dealer will need to take the size and age of your home into consideration to ensure the Model 400 will provide satisfactory comfort and protection through adequate humidification.
