During cold winter months, a low humidity level in your home can make it feel like a desert. Whole home humidifiers add moisture into the ductwork of the heating system in one of two ways: by boiling water into steam and directing that steam into the ductwork, or by drawing warm air from the furnace / air handler through an evaporator pad covered with fresh water and delivering this moisture-laden water into the ductwork.

Professionally installed whole-home humidifiers are a more effective way to humidify your entire home compared to portable units, which can only deliver humidity in the proximity of the room where they’re located. Whole-home humidifiers from Aprilaire help ensure humidity control throughout your entire home.

Types of humidifiers:

Aprilaire whole-home humidifiers can be installed in your heating and cooling ductwork (Model 500), use your furnace blower to move air through a water panel (Model 600), or use a built-in fan to pull heated air directly from your furnace (Model 700). See below for details and differences between these models:

Small Bypass Humidifier

Small Bypass Humidifier

Aprilaire Humidifier - Model 500

The Aprilaire Model 500 Humidifier is economical and a proven performer designed for small to mid-sized homes.

The Aprilaire Model 500 Humidifier is a whole-home solution that helps you achieve total comfort through humidity control. The Model 500 is installed in your central heating and cooling system ductwork by a local HVAC professional.


Model 500 features:

  • Built-in bypass damper, which means fewer parts to install
  • Truly automatic control, but it can also be installed in manual mode
  • Delivers optimum levels of humidity control with the Automatic Digital Humidifier Control.
  • Provides vital service, temperature and relative humidity indicators in manual mode as well.
  • Humidifies tightly constructed homes up to 3,000 square foot in size
  • Performs quietly with simple annual maintenance.
  • Comes equipped with a drain to flush minerals from the unit.
  • Incorporates easy right or left discharge change-over.
  • Has an evaporation capacity of 0.50 gallons per hour
Electrode Steam Humidifiers

Electrode Steam Humidifiers

HS Series

  • Automatic whole home indoor humidification without the need for frequent water re-filling and pad cleaning, when compared to portable humidifiers.
  • Ideal for modulating or variable speed furnaces or air handlers which produce lower air flows and air temperature in the ductwork compared to single stage equipment.
  • High steam delivery rate helps ensure sufficient humidity in your home