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Honeywell Quietcare™ Cool Moisture Humidifier

 HCM-645 Quietcare™ Cool Moisture Humidifier
Model Number: HCM-645
Category: Humidifiers
Color: white
Room Size: Large
Wattage: 61
Warranty: 5 Year Limited
Price: $54.99
Sale Price: $49.99
Save: $5.00 (9% off) Temporarily Out Of Stock

More Information

The 4 gallon Honeywell QuietCare™ humidifier provides invisible, cool moisture. The EasySet™ Electronic Controls are simple to use with individual controls for desired speed and humidity, making it easy to maintain your desired comfort level. The humidifieruses a Protec Antimicrobial treated filter to help prevent the growth of mold and bacteria on the filter. This humidifier is recommended for large size rooms and is ideal for bedrooms and living rooms. It's compact, space-saving design allows for placement anywhere in your home.


  • Up to 30% quieter
  • Easy to clean, carry and fill
  • Dishwasher safe base
  • 12-24 Hour run time per filling
  • Humidifies up to 1,400 sq. ft.
  • Replacement filter: HAC-504/HAC-504AW

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Reviews for the Honeywell Quietcare™ Cool Moisture Humidifier
Rated 4.1 out of 5 (60 reviews)

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So far, so good 

I just received my humidifier today. It's a little louder than I expected, but not more than any other humidifier that I have owned. Set up was simple. The instructions are clear, however, they do not indicate if the unit shuts off automatically if it runs out of water. To situate it on a level surface and away from a wall, I had to put it on a dresser that is shoulder height. Unfortunately, though I am 5'7", the control panel is impossible to read. Thankfully, I have a tall husband. I appreciate that the air comes from the front of the unit vs. the top, avoiding blowing in the direction of the walls. Once I assess it's overall performance and function, I may move it to a lower, smaller surface. So far, I am pleased with my purchase.

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Honeywell QuietCare 

1/22/2014   It is only 5 weeks old and we have had to go through the elaborate cleaning process ofter it stopped puting humitity into the air.  After clearning, it worked for 2 more weeks and the filter seemed stiff so we replaced it with a new one.   After restarting it is still not putting out humidity.  We will call the help line tomorrow.

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Having had other humidifers over the years, I find this HCM645 to be outstanding.  The on/off feature allows the humidifer to add just the right humidity to keep the air at a proper level.  The humidifer tank is easy to fill and I do not have any trouble handling it even though it is 4 gallons.  I would recomment it to anyone who wants a easy way to add humidity to their home. 

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*Studies have shown that keeping indoor air at an RH level of 40-60% reduces survival of flu viruses compared to lower RH levels. When used as directed, humidifiers can achieve and maintain 40-60% RH levels.