Furnaces & Coils

The gas furnace is an indoor unit. It burns fossil fuel to heat air, then circulates it thoughout your home.

Gas FurnaceThe gas furnace burns gas and uses electricity to operate the fan. The efficiency is indicated by its AFUE (Annual Fuel Utilization Efficiency). A 90% AFUE means that 90% of the fuel you use is turned into heat. Furnaces can be direct vented to use outside air for the combustion process rather than using air for which you have already paid to heat.

A gas furnace is most often paired with an outside air conditioning unit. Cool air is manufactured by the air conditioner, then circulated by the fans on the furnace. A gas furnace can also be matched with an outside heat pump. The benefit is that during mild winter temperatures the heat pump pulls warm air from the outside to warm your home without burning gas. When temperatures drop, the furnace then burns gas to add the heat required for comfort. One of the first things to consider when purchasing a gas furnace is its efficiency. This is indicated by the Annual Fuel Utilization Efficiency rating or AFUE. Trane offers a variety of highly efficient gas furnaces, ranging from 78% to 96.7% efficiency. Trane also offers variable-speed and two-stage furnaces, which can greatly increase your comfort level.