Prices, ratings and stock were checked on Amazon on October 22, 2026. The HE240A itself is no longer listed, so the picks below are its closest current matches. HE240A specs come from the earlier review and were not retested.
The Honeywell HE240A was a simple whole-house humidifier. Here is what it did, what replaces it and what upkeep to expect.
Table of Contents
What the HE240A Is
The Honeywell HE240A2001 is a bypass-style whole-house humidifier. It attaches to the furnace or the duct, uses furnace air to carry moisture and controls humidity with a humidistat. It measures 9.5 by 15.7 by 15.3 inches, weighs about 5 pounds and uses Honeywell’s PerfectFLO water control. It lists output of up to 16 gallons a day for spaces to about 3,000 square feet.
Pros and Cons
- Pros: light, mounts on supply or return, installation kit and parts included in its original package, steady moisture.
- Cons: a 1-year warranty, parts that some owners find basic and regular pad changes.
Is It Still for Sale?
The HE240A itself no longer comes up on Amazon. The closest current match is the HE240D, with the same size class. If you have more than 3,000 square feet, step up to the HE360A or the AprilAire. Read our reviews of the Honeywell HE360A and the AprilAire 700.
Here is where whole-house humidifiers are heading: flow-through designs with outdoor sensors and fewer parts to clean. Honeywell’s newer HE240D lists a digital humidistat with an outdoor sensor, and its flow-through siblings keep scale off the pad. The idea is to set a number once and forget it.
3 Whole-House Humidifiers to Consider
Rechecked on Amazon on October 22, 2026. Prices, ratings and buttons are below.
Price on Amazon: $219.99 | 3.4 stars from 28 ratings (checked October 22, 2026)
The Honeywell HE240D lists use in homes of 1,500 to 3,000 square feet, mounts on warm air supply or return ducts, and includes a digital humidistat with an outdoor sensor. It needs a floor drain and seasonal pad replacement. It costs $219.99, rated 3.4 (28), so the rating pool is small.
Price on Amazon: $323.11 | 4.4 stars from 292 ratings (checked October 22, 2026)
The Honeywell HE360A1075 is a powered flow-through humidifier for homes up to 4,200 square feet. The listing says an installation kit is sold separately. It costs $323.11, rated 4.4 (292). Stock was limited on the check date.
Price on Amazon: $524.99 | 4.6 stars from 1.1K ratings (checked October 22, 2026)
The AprilAire 700 is a fan-powered whole-house humidifier rated for homes up to 5,300 square feet. It costs $524.99, rated 4.6 (1.1K).
The downside is maintenance and water. Every whole-house humidifier needs a pad change each season, a clear drain and a clean water line. Hard water crusts the pad, and a missed pad means less moisture and a musty smell. Too much humidity in a cold house can also fog windows and feed mold in wall cavities. Expect more installs that run all winter with no checkups. Set the humidistat low when it freezes outside and check the windows.
Size and Performance
Match the unit to the square footage and how tight the house is. A leaky older home needs more output than a tight new one. For help with sizing, see how to choose the right size humidifier. Compare the types in whole-house central humidifiers.
Noise and Features
Whole-house units are quiet because the furnace blower carries the air. The humidistat is the main feature. An outdoor sensor, like the one in the HE240D listing, lowers the target on cold days so windows stay clear.
Maintenance and Upkeep
- Replace the water panel pad each heating season.
- Check the drain line and the water saddle valve.
- Inspect for white scale and clean it.
- Close the water supply and set the damper to summer mode in warm months.
Whole House or Portable?
A whole-house unit humidifies every room with one setup. Portable units suit one room. See whole-house vs portable humidifiers for the trade-offs.
FAQ
Is the Honeywell HE240A still available?
Not on Amazon. The HE240D is the closest current model.
How big a house does it handle?
The HE240A and HE240D class suits roughly 1,500 to 3,000 square feet.
Does it need a drain?
The HE240D listing says you must have access to a floor drain.
How often do you change the pad?
Once each heating season.
Final Word
Size to your square footage, plan for the drain and change the pad each season.
What comes next: more units that adjust to outdoor temperature on their own, and more smart controls tied to the thermostat. A fan-powered AprilAire or a flow-through Honeywell both work if the filter or pad stays fresh.
Related Guides
Keep going with AprilAire 700 review, Honeywell HE360A review, whole-house central humidifiers, how to choose the right size humidifier and whole-house vs portable humidifiers.
