The Honeywell 1SX1-T is a multi-position modulating furnace that works with single-stage systems. It features a variable-speed blower motor, a 4-way multipoise design, upflow and downflow configurations, and multiple venting options. The 1SX1-T also has a hot surface igniter, a self-diagnostic control board, and a durable, corrosion-resistant heat exchanger. This furnace is designed to provide comfort and energy efficiency, with an up to 97.3% AFUE rating. It is compatible with many Honeywell thermostats, and can be connected to some Wi-Fi thermostats using a communication interface for efficient control of environmental settings.