It’s easy: You’ll see a gas supply line and exhaust flues. Low-efficiency gas furnaces will vent to the roof, while higher efficiency models vent out to an exterior wall. Unlike gas furnaces ...

Installing a furnace in the attic can actually save you money because you can vent it directly through the roof, says Roth. “Duct work installation will not be as tedious or involved ...

You should remove obstructions, or debris, from those outdoor vents that connect to your furnace, gas fireplace, and tankless or conventional water heater. Make sure they’re clear of any ...