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

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? – ...

Skipping the manufacturer's instructions during installation may result in a furnace that fails within six months or less. For example, heat exchangers can crack from improper venting, and gas valves ...

CNET contributor Don Reisinger is a technology columnist who has covered everything from HDTVs to computers to Flowbee Haircut Systems. Besides his work with CNET, Don's work has been featured in a ...