Oil furnaces in the midrange Performance Series are two-stage units providing up to 95 percent AFUE and higher-end features. The Comfort series of entry-level oil furnaces consists of 80-plus percent models that are value-driven and affordable. Carrier furnace modelsĬarrier offers oil furnaces in two series. A variable-speed motor blower uses a technological innovation known as an electronically commutated motor (ECM) with a speed controller to adjust the heating or cooling output your home needs 24 hours a day throughout the year. A fixed-speed motor blower operates at one speed only, whereas a multi-speed blower can be set at a choice of two speeds for better energy efficiency. However, the most advanced gas furnaces today instead use a single modulating gas valve.įurnaces also break down into fixed-speed, multi-speed or variable-speed.

A single-stage gas furnace has only one gas valve, whereas a two-stage furnace has two gas valves for two levels of heating output. Most gas furnaces classify as single-stage or two-stage. The Carrier brand includes about 20 models of gas furnaces and four models of oil furnaces. Carrier is owned by United Technologies, a corporation that also manufactures and sells several other brands of HVAC products, including Day and Night, Bryant and Payne.

Carrier model 58sta070