The Coleman modulating gas furnaces that achieve 98 percent Annual Fuel Utilization Efficiency (AFUE), such as the Echelon™ 33-inch, variable-speed modulating gas furnaces with electronically ...

The Evolution® 987M is a fully modulating gas furnace with load matching performance that delivers up to 98.3 percent AFUE. A modulating gas valve is capable of adjusting from 40 to 100 percent of ...

Dear Jim: We are retired and our interest income from bank CD's is not what it used to be. I thought about replacing our gas furnace to lower our utility bills. What is the most efficient design ...

Question: The repairman says I need a new gas furnace. He recommends a super-efficient one because my chimney also needs repairs. What are my options for the best comfort and why is the chimney a ...