All of these efficient furnaces use two heat exchangers instead of one as in an 80-percent furnace. The second heat exchanger captures so much heat from the furnace, the exhaust gases are cool enough ...

LAS VEGAS — With energy prices due to rise, customers are looking for high-efficiency furnaces that will reduce their energy bills while still providing optimal comfort. They also want smart, ...

The concept of the “high-efficiency furnace” in popular consciousness dates back to the 1980s. That’s when the National Appliance Energy Conservation Act of 1987 required all new furnaces be 78 ...

If it’s time to replace your furnace, you may be wondering if it’s worth the extra investment to buy an energy-efficient system. Or, you may be unsure how to choose an energy-efficient system for your ...

Q I made energy improvements to my house, but my 25-year-old gas furnace does not keep it as comfortable as before. Also, I think my gas bills should be lower? Which 2008 furnace models are most ...

Erin Gobler is a personal finance writer based in Madison, Wisconsin. She writes about topics including budgeting, student loans, credit, mortgages, investing and insurance. Her work has been ...