Aprilaire Model 400 Automatic Whole House Water Saver Furnace Humidifier for up vs AprilAire 500 12-gal. Whole-House Small Bypass Evaporative Humidifier with Autom
Updated August 2026 — The Aprilaire Model 400 is better for larger homes and water conservation, while the AprilAire 500 offers easier installation for smaller spaces.
The Aprilaire Model 400 is better for larger homes and water conservation, while the AprilAire 500 offers easier installation for smaller spaces.
Why Aprilaire Model 400 Automatic Whole House Water Saver Furnace Humidifier for up is better
Coverage Area
Model 400 covers up to 4,000 sq. ft.
Water Efficiency
Model 400 evaporates 100% of water used.
Humidity Control
Model 400 has dual sensors for better responsiveness.
Why AprilAire 500 12-gal. Whole-House Small Bypass Evaporative Humidifier with Autom is better
Price
AprilAire 500 is C$400.00.
Installation Kit
AprilAire 500 includes all necessary parts.
Brand Trust
Both are from Aprilaire, but 500 has a simpler setup.
Overall score
Specifications
| Spec | Aprilaire Model 400 Automatic Whole House Water Saver Furnace Humidifier for up | AprilAire 500 12-gal. Whole-House Small Bypass Evaporative Humidifier with Autom |
|---|---|---|
| Brand | Aprilaire | Aprilaire |
| Current Price | C$407.00 | C$400.00 |
| Daily Output | 17 gallons | 12 gallons |
| Coverage Area | 4,000 sq. ft. | 3,600 sq. ft. |
| Humidity Range | 35%-45% | 40%-60% |
Dimension comparison
Overview of Whole House Humidifiers
Whole house humidifiers are essential for maintaining a comfortable indoor environment, especially in regions where dry air is prevalent. The Aprilaire Model 400 Automatic Whole House Water Saver Furnace Humidifier and the AprilAire 500 12-gal. Whole-House Small Bypass Evaporative Humidifier are two popular options in this category, each offering unique features tailored to improve air quality and comfort. Priced at C$407.00 and C$400.00 respectively, these humidifiers provide effective solutions for keeping humidity levels in check for larger homes.
Health Benefits
Both the Aprilaire Model 400 and the AprilAire 500 focus on enhancing health by managing indoor humidity. The Model 400 is designed to help alleviate health issues related to dry air, such as dry skin and respiratory problems, by maintaining humidity levels between 35% and 45%. This range is known to reduce the incidence of respiratory infections, allergies, and asthma symptoms. Similarly, the AprilAire 500 aims to minimize the growth of bacteria, viruses, and dust mites that thrive in low humidity, contributing to a healthier living environment. Both products address critical health concerns, emphasizing the importance of proper humidity in home wellness.
Coverage Area
When it comes to coverage area, the Aprilaire Model 400 excels by servicing homes up to 4,000 square feet, making it suitable for larger spaces. In contrast, the AprilAire 500 effectively covers homes up to 3,600 square feet. This difference in capacity indicates that the Model 400 might be a better choice for larger households or those with expansive layouts. Both units deliver significant moisture output, with the Model 400 providing a capacity of 17 gallons per day, compared to the 12 gallons offered by the AprilAire 500.
Water Efficiency
Water conservation is a key feature of the Aprilaire Model 400, which employs a unique process that evaporates 100% of the water flowing into its panel. This efficiency not only helps in reducing water waste but also contributes to more effective humidification. The AprilAire 500, while also efficient, focuses on a reliable water panel that removes impurities before adding moisture to the air. Both models support environmentally friendly practices, but the Model 400's approach to water savings may appeal to those particularly concerned with water conservation.
Automation and Control
Both humidifiers come equipped with automatic controls to ensure optimal humidity levels. The Aprilaire Model 400 uses dual sensors to monitor outdoor temperature and indoor humidity, adjusting automatically to maintain desired conditions without user intervention. On the other hand, the AprilAire 500's Model 60 Automatic Digital Humidistat actively measures relative humidity and uses an onboard sensor to turn the humidifier on and off as needed. Both systems provide peace of mind, but the Model 400's dual sensor setup offers a potentially more responsive approach to changing environmental conditions.
Installation Convenience
Installation is a critical factor for many consumers, and both units come with comprehensive installation kits. The AprilAire 500 includes all necessary components for installation in homes with ducted heating systems, along with detailed instructions. This all-in-one package simplifies the installation process, making it user-friendly for those who prefer a straightforward setup. The Aprilaire Model 400, while also designed for easy installation, does not emphasize the inclusion of an installation kit as prominently, which may require buyers to source additional parts separately.
Brand Reliability
Aprilaire has established itself as a leader in indoor air quality solutions since its inception in 1954. Both the Model 400 and the AprilAire 500 are designed and assembled in the USA, showcasing a commitment to quality and reliability. Additionally, both products come with warranties—though specific warranty details were not highlighted, buying from a reputable brand like Aprilaire provides confidence in product durability and customer support.
Which should you buy?
Choosing between the Aprilaire Model 400 and the AprilAire 500 largely depends on your specific needs and home size. If you have a larger space and are particularly focused on water conservation, the Model 400 stands out with its higher coverage area and efficient water usage. However, if you prefer a more straightforward installation process and are dealing with a slightly smaller home, the AprilAire 500 offers robust features and technology at a slightly lower price. Ultimately, both humidifiers excel in improving indoor air quality, making either a solid investment for enhancing comfort and health in your home.
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