Air-O-Swiss AOS 7147 Ultrasonic Humidifier – Warm and Cool Mist Review



Air humidifiers can produce either warm or cool mist, depending on your preference, to help add moisture to the air. The Air-O-Swiss AOS 7147 combines both warm and cool mist humidifiers in one compact unit. During winter or colder seasons, some people prefer the warm mist as it makes the room more comfortable. If you think you can use both the warm and cool mist functions, this model will be more practical for you rather than buying two separate units.

Air-O-Swiss AOS 7147 Ultrasonic Humidifier - Warm and Cool Mist

Important Features and Specs

The AOS 7147 Ultrasonic Humidifier uses high-frequency vibrations to generate a micro-fine mist into the room, which immediately evaporates to add moisture to the air. It can cover up to 600 square feet or standard sized rooms. To choose between warm and cool mist, simply press the uppermost icon on the left side of the control panel.

The humidifier comes in a sleek black base and a clear blackish tank. It is a little bulkier than other standard sized humidifiers, with dimensions of 14 x 11.6 x 11.6 inches, Width, Depth, and Height (WDH) and weighs 9 pounds. It must be placed on an elevated flat surface, like a counter, desk, or side table. It has an elegant look to it and would go well with any interior because of the black tones.

When on the warm mist setting, the humidifier preheats the water so that the mist comes out nice and warm. It is great during the winter to help soothe dry eyes, chapped lips, dry throat and skin. You may think that a heater will be enough to do the job but it can only do as much as keep the room warm. Depending on your location, cold weather usually brings about dry air and it causes irritation to the skin, nasal passage and throat. A humidifier will help moisten the air to avoid those problems.

The cool mist does the same and offers the same comfort except, it keeps the room a little cooler. It is ideal for the warmer seasons. It features an intelligent temperature control which automatically adjusts the humidity level of the mist based on the temperature inside the room. The mist comes out as visible thin moist air from two separate nozzles. You can adjust these nozzles to two different directions to spread the mist evenly in the room.

It features a digital control panel where you can adjust the mist settings from low, medium to high. It also lets you program the humidifier to run up to 8 hours and automatically turn off. If not, you can set it to continuous operation. The humidifier will still automatically stop once the room reaches the appropriate humidity and resume producing mist when the levels change. This is a great way to save on energy costs.

Another unique feature that this model offers is the demineralization cartridge which helps in filtering mineral deposits in the water so it is safe to use tap water, unlike most humidifiers that require distilled water.

It is easy to fill and clean the water tank. Simply lift the tank from the base and fill it from the bottom cap. The opening is wide which allows you to reach in and wipe the inside of the tank with a clean cloth. The machine will tell you when it is time to clean the unit, by displaying an icon on the digital screen.


  • Quiet
  • Allows tap water or hard water
  • Automatic humidity adjustment
  • Timer / programmable auto off
  • Easy to use and clean
  • Wide opening on the tank
  • Nice design


  • Does not run very long; maximum 18 hours and less on high mist setting
  • Requires regular cleaning

Who Should Buy

If you think you can benefit from both the warm and cool mist, this unit is a great choice because it is more practical than buying two separate humidifiers for different seasons. It is a little expensive, even with two humidifiers combined, but the advantage is, you only have one unit to maintain.

This is great for those who are noise sensitive because it is very quiet and you won’t even notice it when you are sleeping. One common remark from customers is that the machine prompts you to clean the tank a little too often. So if you don’t like regular cleaning, this may not be an ideal product for you.


The Air-O-Swiss AOS 7147 Ultrasonic Humidifier – Warm and Cool Mist is a unique humidifier that can produce both warm and cool mist. It is a little expensive but it offers advanced features like automatic humidity adjustment and digital control panel. It also becomes more practical in the long run because it doesn’t require distilled water unlike most humidifiers. You can use hard water because of the included demineralization cartridge. It comes in a nice sleek design and is very quiet.