LX Series

• The LX series of gas furnaces have an AFUE rating between 80 and 97 percent. The AFUE rating refers to the overall efficiency of your gas furnace. For example, if you furnace is 97 percent efficient, that means that about 97 cents of every dollar that you spend on heating goes directly to keep your house warm. Generally, the models in this series feature an electronically commutated motor variable speed fan with the Coleman EcoTrak technology. This technology allows you to choose the airflow of the fan. You receive a 10-year warranty on parts and a 20-year warranty on the heat exchanger, and the heat exchanger is made of aluminized steel.
  
  

Echelon

• The Echelon series of gas furnaces include the CPLC and CP9C models, and the CP9C series has an AFUE rating of 98 percent. Both of these units come with a 10-year warranty of parts and a lifetime warranty on the heat exchanger. These units come with variable speed motors and run at a continuous pace, which keeps the furnace from stopping and starting. This makes the unit more efficient. You can choose the model that's right for you based on the type of climate where you live.
  
  

TG8S

• The Comforteer Series TG8S model furnace is specifically for tight corners like attics or closets. You can purchase this unit with the Hybrid Comfort System, and you can purchase a model that works with your LoNox system. This system allows you to set your own heat, or you can set it up to automatically choose the right temperature for your home based on the outside temperature. You receive a 10-year warranty on parts and a 20-year warranty on the heat exchanger.
  
  

TG9S

• The Comforteer Series TG9s gas furnace has an AFUE rating up to 95.5 percent, and you get a 10-year warranty on parts and a lifetime warranty on the heat exchanger. The cabinet is 33 inches tall, and this unit is Energy Star rated. It comes with the Hybrid Comfort System, and it's insulated, which reduces noise.