The Association of Home Appliance Manufacturers (AHAM) tests room humdifiers using uniform testing methods to verify water output ratings and to allow consumers to accurately compare models. For AHAM's Directory of Certified Humidifiers, send a personal check or money order for $5.00 to AHAM, 20 North Wacker Drive, Chicago, IL, 60606. Note the publication's name in your correspondence.
When buying a tabletop humidifier, check to see whether or not it has a humidistat and the number of speeds or settings it has--some have two or three speeds or a quieter night setting, for example. Types of controls are also important on a console humidifier. It should have a low-water light, automatic humidistat, and air-flow controls. Multi-speed and variable air-flow settings and an automatic shut-off are also helpful. Some models even have a light that goes on when the filter is dirty.
For any type of humidifier that must be filled manually, find out how often it must be refilled when running at full speed.
If you're looking into a central humidifier, be sure it can be installed relatively easily, considering the configuration of your heating system . In most cases, maintenance is limited to changing a evaporator pad about once a year--this component should be easy to inspect and access.
Central units are sold at home-improvement centers or by heating equipment dealers. If you're an accomplished do-it-yourselfer, a dealer can help you with proper sizing, making sure you have all the necessary components, and installation advice. If you haven't done this type of work before, have the unit professionally installed.
To insure lasting and safe performance of a humidifier, be sure to follow manufacturer's directions for use and care.
