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Trane
26,000 BTU Gas Furnace
Trane 80% AFUE, Single-Stage, Upflow/Downflow/Horizontal, 14.5" Cabinet | S8X1A026M2PSC
$1,744.99
A 26,000 BTU gas furnace is one of the smallest residential sizes — a fit for compact homes, tightly sealed new construction, additions, or mild climates where heat loss is low. In a small load like this, resisting the urge to oversize is the whole game.
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Furnaces are rated by heat input in BTU, and the heat they actually deliver depends on efficiency (AFUE). For a small or well-insulated home, a modest 26,000 BTU unit is often plenty — installing something larger just means short, inefficient cycles and uneven warmth. The furnace blower also has to match your cooling coil's airflow, so size the two together.
Heating a small or tight home? We'll confirm 26,000 BTU is the right input →
Small, tightly sealed, or mild-climate homes and additions. Because heating need depends on heat loss rather than square footage alone, a heating load calculation is the accurate way to confirm this size fits.
For a compact or well-insulated home in a mild climate, no — it can be exactly right. For a larger or colder-climate home it would be undersized. Sizing to the actual heat loss avoids both extremes.
Furnace ratings usually refer to heat input. The usable heat output is the input times the AFUE — an 80,000 BTU input furnace at 80% AFUE delivers about 64,000 BTU of heat.
The furnace blower moves air for cooling as well, so it must be paired with a compatible coil and sized for adequate airflow. Match the blower capacity to your AC and coil.