When it comes to purchasing a humidifier, there are a few key factors you should consider. Size, type, and noise level are all important considerations when purchasing a humidifier.The size of the humidifier is important. You need to make sure that the humidifier you choose is the right size for the room you plan to use it in. Some humidifiers are small and only suitable for use in a small room, while others are large and can be used in a room up to 400 square feet.The type of humidifier is also important. There are four main types of humidifiers: evaporative, impeller, ultrasonic, and steam vaporizer. Each type has its own benefits and drawbacks. Evaporative humidifiers are the least expensive and most energy efficient, but they also require regular maintenance. Impeller humidifiers are also inexpensive and fairly energy efficient, but they can be noisy. Ultrasonic humidifiers are quiet and efficient but can be expensive. Steam vaporizer humidifiers are the most expensive but also the most effective at increasing humidity levels.Noise level is another important consideration when purchasing a humidifier. Some humidifiers are very loud and may not be suitable for use in bedrooms or other quiet spaces. Others are very quiet and may be suitable for use in any room in your home.Consider these factors when purchasing a humidifier to ensure you find one that meets your needs and fits your budget.