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The Williams Forsaire is a 55,000 BTU natural-gas wall furnace that vents out the top and heats up to about 1,080 sq ft. It uses counterflow air to push warm air low into the room, has a 45–99°F thermostat range, and mounts in a slim 14-inch-wide footprint. At $899 at First Truck Parts as of November 7, 2026, it sits at the top of its recent range across the four stores that list it new.
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Lowest price we've seen: $899.00 on Nov 7 at First Truck Parts. Tracked across 4 stores since Nov 7.
Rated 4 out of 5 from 65 ratings, the Forsaire is generally seen as a dependable, simple wall furnace. Owners like the even counterflow heat and the small footprint; complaints center on efficiency and the extra parts needed to install.