Our ultra-low NOx furnace is the great choice for 80% AFUE comfort inside and reduced NOx emmisions outside. It delivers comfort you can rely on with a 65% reduction in NOx emissions compared to a standard, low-NOx model. As part of a complete, year-round comfort system, this single-speed furnace can be setup to deliver more optimized airflow to your living spaces with our discrete tapped blower motor. And, if you combine our ultra-low NOx furnace with a compatible thermostat and Carrier® heat pump, you'll enjoy the additional comfort and efficiency benefits of a Hybrid Heat® system.