These single-stage furnaces are available in models that offer over 80 and 92 percent AFUE efficiency. The furnaces, which are less than 35 inches tall, are ideal for small spaces or accommodating larger, high-SEER coils, says the company. They can be installed free-standing in a basement or enclosed in a closet or alcove. The 92-plus percent furnaces can be vented vertically or horizontally, using either a one- or two-pipe system. The diagnostic lights allow simplified troubleshooting; one light indicates flame signal strength, while two others work in combination to indicate all other fault codes. Contractors also have the option to add a high-efficiency blower kit for a SEER improvement of up to 1 point on select models.

Tappan, St. Louis, MO;

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