Carrier's line of furnaces include many that have a high-efficiency rating. Some Carrier furnaces are so efficient that they have earned the U.S. Environmental Protection Agency's ENERGY STAR rating.
Carrier's website lists a variety of different types of furnaces ranging from gas to oil-burning furnaces. Each of the products has a detailed description, including the energy-efficiency rating of the product's operation. As of February 2015, the lowest rating listed for any of the products is 80 percent energy efficiency, while the highest rating is 98 percent. Carrier has also developed Greenspeed Intelligence technology that combines high efficiency with quiet operation.