The best humidifier for your needs will depend on the amount of air space you want to humidify, what kinds of temperatures you are dealing with and whether there are children or pets in the area. For example, if you want a room humidifier on while you sleep, you should look into the best humidifier for a bedroom.
A warm mist humidifier is great for cold weather. If choosing a cool mist humidifier, the decision between an evaporative humidifier and an ultrasonic one often comes down to capacity and noise. Evaporative coolers can achieve a greater capacity, making them a good choice if you need to humidify your entire house. If you want something quiet, go ultrasonic.
If your air humidifier uses a filter, make sure to change it regularly to keep your air cleaner. You can also improve the air in your home by investing in an air purifier to remove pollution particles and common allergens like pollen and dander. If you are looking for a machine that actively cools your home while increasing humidity, you might enjoy an evaporative cooler.