Best humidifiers under $50 humidifiers are one of those things that can cool a room. It’s the type of thing you would add to your home to help reduce room temperature. The type of room it helps is the type of room that you have in your house. When you add a humidifier, you’re kind of replacing one of the air conditioning units in your home. It’s not just to cool down or warm up a room, but it’s also to help with the humidity in the room.