A premium or high-end forced-air furnace is typically thought of as having an annual fuel utilization efficiency (AFUE) of 90% or above. These furnaces also usually come with other amenities, such as variable-speed motors, sophisticated controls, and longer warranties.
For one manufacturer, a premium furnace encompasses all of the above, as well as improved igniter technology. Nordyne, St. Louis, MO, manufacturer of furnaces bearing the premium brand names Maytag, Tappan, Frigidaire, Philco, and Westinghouse, decided to tackle the issue of premature igniter burnout two years ago.