What are the differences in Trane’s single, 2-Stage, and Variable Speed Gas Furnaces?
A single stage furnace will deliver the same amount of heat and airflow no matter what the temperature outside. A 2-stage furnace with a 2-stage thermostat will begin in first stage (low burner, low airflow) and only go to second stage if the indoor temperature drops during first stage. This makes the furnace run longer, providing greater air circulation, temperature distribution, and air filtration. This also provides more consistent comfort. The second stage will only come on when the need is there and then it will be able to run longer and maintain the comfort level. The more your system starts and stops, the less comfort you will have and less efficiency due to duct heat loss. The advantage of Trane’s 2-stage, variable speed furnace is it has Comfort-R™ Enhanced mode. This allows the blower to slowly ramp up and ramp down or operate at 50 percent of the cooling air speed in the FAN ON position. This provides greater humidity control, quieter operation, and maximum air circulation,
