The more efficient a furnace,
obviously, the lower your energy bill for heating. Calculating a
furnace's energy costs requires considering both the gas it burns and
the electricity it consumes to run its blowers and controls.
How efficiently a furnace converts gas into heating energy is reflected
in its annual fuel-utilization-efficiency (AFUE) rating, which is
measured as a percentage. The higher that percentage, the more heat the
furnace can wring from each therm of gas—and the lower the environmental
impact of its emissions.
Furnaces have generally become more energy-efficient over the years. A
typical gas furnace made in the early 1970s has an AFUE of about 65
percent. Today, the lowest efficiency allowed by law for new gas
furnaces is 78 percent, and Trane's
most efficient models have an AFUE of reaching 95% of total gas
input.
Below are Trane's 90%+ model's gas
fired furnaces. These furnaces can use natural gas or propane with
conversion kits.
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