Can I Put Hot Water In A Cool Mist Humidifier?

Using a cool mist humidifier is good for congestion and other symptoms of the common cold. However, it is more important to consider putting the correct type of water into your humidifier when you're trying to adjust your humidity level. 

Using cold water is the intended use of cool mist humidifiers, so it is best to follow the manufacturer’s recommendations of cool water. Also, warm water vapor is not as breathable as a cool mist and does not provide the same benefits in terms of adding moisture. If you require the use of hot mist or steam, you may need a different device, such as a steam vaporizer or warm mist humidifier. 

While you can technically put hot water in a cool mist humidifier, it is not recommended. Officials say that cold mist is safer for babies and pets and helps you breathe better than hot mist when you're trying to combat dry air. You will also be forfeiting any warranty you have on your device by using it improperly with this kind of water. Using crisp, clean water will help you get the most out of your cool mist humidifier. 

Keep reading for more information about cool mist humidifiers and their benefits!

Cool Mist Vs. Warm Mist Humidifiers

Both cool mist and warm mist humidifiers have their benefits. However, these types of humidifiers can not be used interchangeably unless the specific model allows for it. Most devices are one-trick ponies: they either use cool mist or warm mist, but not both. There are also central humidifiers that work to add moisture to your entire house, but these are another story.

Cool mist humidifiers are great for adding humidity to a room or area. They are especially useful for young children who may require the extra humidity but cannot be trusted with hot appliances. Cool mist humidifiers like impellers generally use less electricity, as they do not heat the water before dispersing it. They use a small fan to disperse the vapor or even ultrasonic vibrations. 

Warm mist humidifiers perform the same general function as cool mist, with the added function of using a heating element on the water. They are generally thought of as a healthier alternative because the boiling process kills microorganisms, impurities, and mold that may be present in the water so that they don't affect the indoor air quality. Warm mist humidifiers are quieter, as the water naturally disperses after being steamed, as opposed to a fan running like the cool mist evaporative humidifiers. Note that these are not the same as air purifiers, as they cannot completely remove allergens from the air.

However, warm mist humidifiers usually have a higher upfront cost and require more cleaning. When water boils inside, mineral deposits are left behind and require frequent cleaning to avoid damaging your device with the buildup. That being said, an ultrasonic cool mist humidifier will run quietly and efficiently with less risk of mineral content deposits, although they still need to be cleaned and undergo a demineralization process, as white dust begins to build up.

Your choice of device will depend on the benefits you require and the use it will receive. It is never recommended to put hot water in a cool mist humidifier. If you require a warm mist for your home, you should purchase the correct appliance to perform that function. Otherwise, you run the risk of ruining your equipment.

Benefits Of Cool Mist

As stated by the FDA, cool mist is much more breathable than hot mist. Cool mist provides maximum benefits to congestion and coughing and can create more refreshing spaces. Move the humidifier anywhere in the house for effective results. 

The cool mist, plus benefits from essential oil, is a therapeutic luxury that is more affordable than ever. The Ultrasonic Cool Mist Humidifier 6L is available in a larger size than the 4L to give you more of what you need. Therapeutic mist can be abundant in every space to promote health and wellness. 

Cool mist is known for its therapeutic effects even without the essential oils. However, the combination is effortless to help alleviate asthma, cold symptoms, allergies, plus reduces airborne free radicals. Virus and bacteria can all be reduced by adding blends of antiviral and antifungal oils. Lemon, clove, cinnamon, and more have benefits for flu season. 

The cool mist output is quieter than ever and is soothing for every bedroom. With the adjustable mist level dial, you can choose how you want your experience to be. Both Ultrasonic humidifiers feature essential oil trays and customizable experiences at the tips of your fingers, while you also get the benefits of humidification. 

Cool mist promotes better breathability and increases the relative humidity in any space. Breathing in cool mist is said to be better for the lungs than hot humidity. With the cool mist humidifiers available at Everlasting Comfort, you can have the maximum benefits of aromatherapy and cool mist air. 

Cool mist is recommended for people who want to support their respiratory functions and stop the spread of viruses and bacteria in every space. With up to 50+ hours of cool mist, our humidifiers can create lasting benefits for your health and wellness. 

Using a humidifier promotes lung and sleep health while aromatherapy provides benefits for sleep, stress, anxiety, and immune health. The list could go on about how many positive benefits there are to using a cool mist humidifier. 

Better yet, humidifiers tend to be budget-friendly and are cheaper than similar warm mist devices. You don’t have to break the bank on sessions of therapy and healing. You can have therapeutic spaces all throughout your home for life-changing results. And, with its two-in-one design, you can enjoy the benefits of two different methods of therapy: mist humidifying and aromatherapy.

Filling The Humidifier Water Chamber

The Ultrasonic Cool Mist Humidifier 4L has a sleek design but is operated much like a regular humidifier. You can follow the manual or follow instructions such as these. It’s designed to blend into your home while promoting optimal wellness for everyone in your family. It employs easy to use technology and operates with just a few simple steps.

You’ll want to fill your filtered water to the line and number marking in your water tank. Then, add a few drops of your favorite blend into the essential oil chamber. 

Remember, you can always fill the water chamber and fill up as needed. Do not overfill the chamber as the room humidifier will not work effectively. Generally people considering tap water to be fine for use in humidifiers, although if you have hard water you may want to use filtered water.

Adding a cool mist humidifier to your home is affordable and effective with the Ultrasonic Cool Mist humidifier. It’s great for the nursery, college dorm, office, house, or any space! 

Essential Oils and Aromatherapy 

Some cool mist humidifiers allow for the use of essential oils, like ours at Everlasting Comfort. The benefits of aromatherapy can compound with the cool mist to provide extra relief. Only use essential oils in a cool mist humidifier if your specific model allows it. In other models, it may cause issues and break your device. 

Clove essential oil is said to have antiviral and antifungal properties. When introduced to your home, the clove oil will help protect your family from airborne pathogens. 

Peppermint essential oil in a diffuser is said to help reduce coughs and other respiratory infections. Add a few drops to your humidifier to clear the sinuses and provide a soothing scent to your home.

Lavender essential oil is known to be a stress-relieving agent when used in aromatherapy. It also helps with fatigue, depression, and headaches. It is best used in your cool mist humidifier in the evening to help your family wind down and have a good night’s rest. 

Rosemary essential oil has the potential to clean the air in your home. It can also be used in the diffuser to prevent bugs in your area. It also provides the recognizable smell of rosemary to help calm your mind. 

Eucalyptus essential oil is a common scent used to aid in respiratory issues. It is also said to be a fever reducer and a virus fighter. Be sure to use this one when someone has the flu or the common cold in your home.

Cedarwood oil has been used for a variety of functions. It has been used for anxiety issues and has been shown to have a soothing effect on animals in lab studies. It has been used topically for acne treatments, so it may have a small benefit on your skin when used in diffusion.

There are many other oil varieties. Be sure to find the ones that work best for you!


As you can see, cool mist humidifiers are a great way to add much-needed humidity to your home. However, the devices should not be mistaken for vaporizers or warm mist humidifiers. It is not recommended to use hot water in a cool mist humidifier. If you require warm mist in your home, you should seek out the appropriate device. 

Many people require humidity to breathe and live better. They can help make the room feel warmer, and function to moisten your nasal passages for maximum comfort. If you live in a dry area, you may benefit from the addition of cool mist in your home. Cool mist humidifiers are great for kids’ rooms and nurseries, as the devices do not produce heat like their warm mist counterparts. In addition, many models have an aromatherapy tray that allows you to enjoy the many benefits of essential oils. 

Here at Everlasting Comfort, we are committed to providing you with high-quality wellness items that we are proud of. For that reason, both of our Ultrasonic Cool Mist Humidifiers come with a 2-year replacement warranty. Even more, our larger, 6L model comes with a 30-day Money Back Guarantee. There is no reason not to try a cool mist humidifier in your home!


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