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

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 ...

Replacing the old furnace in your central heating system with a new, more efficient model can offset volatile energy prices. Money aside, today’s furnaces pollute less and boost comfort by producing ...