Bob is a service technician who is well trained and nationally certified. However, he has sometimes suffered from the same confusion that all technicians occasionally do — the facts that he gathers ...

Dear Jim: 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 ...

Q. 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 factor? A.

Q. I am researching 2009 super-efficient gas furnaces, which I hear can cut my gas bills in half. I am confused by the terms like "stages," "variable blower speeds," "condensing," etc. Please explain ...