Temperature is just one factor in total home comfort, especially in dry weather. An Envirowise humidifier provides the right amount of moisture in every room, and can help alleviate allergy symptoms. The EHUMD comes in two models: the EHUMD200 and the EHUMD300. The EHUMD200 has a capacity of 12 gallons per day, while the EHUMD300 has a capacity of 16.8 gallons per day. Ask your dealer which system is best for the size of your home.