Gas furnaces generate heat by burning natural gas. They’re available in varying sizes and energy efficiencies and produce a hot, dry heat. While still the most widely used furnaces, they’re starting ...

Dear EarthTalk: I’ve heard that gas stoves are bad for indoor air quality, but what about gas furnaces and other gas-powered appliances typically found in homes? – L.J., Ronkonkoma, NY Natural gas is ...

POTENTIAL PROSPECTS: Condensing units like this one, typically enjoying efficiencies of 90 percent and above, would find more opportunities if proposed energy conservation standards squeeze ...

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 ...

Venting rules change with efficiency — and mixing them up can lead to moisture buildup, heat exchanger damage, and dangerous combustion issues.