These upflow/horizontal two stage burner furnaces come with a 9 speed blower and operate at 96% AFUE. Meaning that 96 cents of every dollar of gas used goes into heating your home.
A two stage burner means your unit will operate at 70% of maximum capacity. If more heat is needed it will turn on the second stage and run at 100% for as long as needed. This results in longer cycles and more even temperature without spending more on your energy bill.