Furnaces with constant torque motors offer improved efficiency while delivering greater comfort and cost savings. Two-stage furnaces offer both high and low output settings that calibrate furnace heat flow to thermostat settings. Ultra-low emission Lennox furnaces burn away more NOx gases and result in cleaner emissions, healthier for you and the environment. Variable speed furnaces prevent large temperature fluctuations and reduce operating costs while providing consistent heating with lower humidity. Different models include variable speed, ultra-low emission, and two-stage furnaces. Within those two fuel types, different furnace models offer different features. Most Lennox furnaces run on gas, but some use oil instead.
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