Gas and Oil Home Heating Furnaces - Furnace Efficiency

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msmity29
04-28-06, 12:06 PM
Roughtly how much more energy is saved when a 93% energy efficient gas furnace is used as opposed to a 91%? What is the major difference between a single stage opposed to a dual stage? Thanks!

Grady
04-28-06, 03:52 PM
The major difference in a single stage & a two stage furnace is comfort. The vast majority of the time, the two stage furnace will operate on low providing longer run times & more gentle heat. Most will only kick into high on demand from a setback thermostat or if the low fire won't keep up.